<p>Find the sum of `-7` and  `5` using the model below.</p><SignTiles data-props='{  "items": [    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "-",          "color": "red",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    }  ]}'></SignTiles > + <SignTiles data-props='{  "items": [    {      "signs": [        {          "value": "+",          "color": "green",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "+",          "color": "green",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "+",          "color": "green",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "+",          "color": "green",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    },    {      "signs": [        {          "value": "+",          "color": "green",          "highlight": false,          "disabled": false        }      ],      "highlight_pair": false    }  ]}'></SignTiles >