Question

alguém sabe 4 × - 12 = ×?​

Answer 1

$4x - 12 = x \\ 4x - x = 12 \\ 3x = 12 \\ x = 4$

Answer 2

Resposta:

$4x-12=x\\ \\ 4x-x=12\\ \\ 3x=12\\ \\ x=\dfrac{12}{3}\\ \\\boxed{ x=4}$