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Kristy asks Lonnie to think of a number, add $3$ to it, multiply the sum by $2$ , and then subtract $6$ . Let $n$ stand for Lonnie's starting number. Which expression represents Lonnie's final number?$\newline$$$\begin{array}{c} 2(n+3)-6 \\ 2(n+3-6) \\ n+3 \times 2-6 \\ 2 n+3-6 \end{array}$$$\newline$