Question

x+x+13=x+36 e essa aki pf x+x=x+20

Answer 1

x+x+13=x+36
2x-x=36-13
x=23

x+x=x+20
2x-x=20
x=20

Answer 2

RESPOSTA  X+X+13=X+36
                    X+X-X=36-13
                     R:X=23