Question

Resolva as equações :² Please.

Answer 1

Olá,

12.

(3-2x)/2 = (1+3x)/5
5(3-2x) = 2(1+3x)
15-10x = 2+6x
-10x-6x = 2-15
-16x = -13
x = -13/-16
x = 13/16

13.

(2x-1)/3 = (5x+2)/7
7(2x-1) = 3(5x+2)
14x-7 = 15x+6
14x-15x = 6+7
-x = 13
x = -13