Question

$\frac{6}{ \times } = \frac{4}{ \times - 3}$
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Answer 1

Basta multiplicar cruzado:

$\frac{6}{x} = \frac{4}{x - 3} \\ 6x - 18 = 4x \\ 6x - 4x = 18 \\ 2x = 18 \\ x = \frac{18}{2} \\ x = 9$

X = 9.