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Let’s check out your problem:

(7)/(x)=(4)/(12)

7x=412 \frac{7}{x}=\frac{4}{12}

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Full solution

Q. 7x=412 \frac{7}{x}=\frac{4}{12}
  1. Cross multiply: Cross multiply to solve for xx: 7×12=4×x7 \times 12 = 4 \times x.
  2. Do multiplication: Do the multiplication: 84=4x84 = 4x.
  3. Divide to isolate xx: Divide both sides by 44 to isolate xx: x=844x = \frac{84}{4}.
  4. Calculate division: Calculate the division: x=21x = 21.

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