Question

qual é o resultado de 13x-12=9x+16

Answer 1

$13x-12=9x+16\to \\\\ 13x-9x=16+12\to \\\\ 4x=28\to \\\\ x= \dfrac{28}{4} \to \\\\ \boxed{x=7}$

Answer 2

13x - 9x = 16 + 12
4x = 28
 x = 28/4
 x = 7