Question

PFVR ME AJUDEM NESTA QUESTÃO

Answer 1

Explicação passo-a-passo:

7x + 5x = 420

12x = 420

x = 420/12

x = 35

b)

x . 2 = -8 . 3

2x = -24

x = -24/2

x = -12

c)

5x -5 + 6x + 4 = 230

5x + 6x -5 + 4 = 230

11x -1 = 230

11x = 230 + 1

11x = 231

x = 231/11

x = 21

d)

15x -15 + 10x + 10 = 12x -18

15x + 10x -15 + 10 = 12x -18

25x -5 = 12x -18

25x - 12x = - 18 + 5

13x = -13

x = -13/13

x = -1