Question

Pfvvvv alguém me ajudaaaaa a fazer essas contas

a) 3(×-4)=18

b) -6+3×=-2(×+7)

c) -5(×-5)=-25

d) 4(×+3)=-3

e) -7(-×+3)=3×​

Answer 1

Resposta:

a) 3(x-4)=18

(=) 3x-12=18

(=) 3x=18+12

(=) 3x= 30

(=) x = 10

b) -6+3x=-2(x+7)

(=)-6+3x=-2x-14

(=)3x+2x=-14+6

(=)5x=-8

(=)x=-8/5

c) 5(x-5)=-25

(=)5x-25=-25

(=)5x=-25+25

(=)5x=0

(=)x=0

d) 4(x+3)=-3

(=)4x+12=-3

(=)4x=-3-12

(=)4x=-15

(=)x=-15/4

e) -7(-x+3)=3x

(=)7x-21=3x

(=)7x-3x=21

(=)4x=21

(=)x=21/4