Question

a) 9x -2 = 4x + 18

b) 2x - 10 + 7x + 10 =180​

Answer 1

a) 9x-4x= 18+2
5x= 20
x= 20/5
x= 4

b) 2x +7x= 180 (cancela os 10, pois possuem sinais diferentes)
9x= 180
x= 180/9
x= 20

Answer 2

Resposta:

Questão A:

$9x - 2 = 4x + 18$

$5x = 18 + 2$

$5x = 20$

$x = \frac{20}{5}$

$x = 4$

Questão B:

$2x - 10+ 7x + 10 = 180$

$2x + 7x - 10 + 10 = 180$

$9x = 180$

$x = \frac{180}{9}$

$x = 20$