Question

 3/4x= 12, what must x be? x=16x=4x=3x=48

Answer 1

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1) Considering that the coefficient of the x term is a fraction, we need to multiply both sides by another so that we keep with x on the left side.

$\begin{gathered} \frac{3}{4}x=12 \\ \frac{4}{3}\times\frac{3}{4}x=12\times\frac{4}{3} \\ x=16 \end{gathered}$

Note that, since we must always multiply or divide both sides when we do that we end up solving for x.

That's the answer:

$x=16$