Question

A) 7× -12 = 2× +37 ?

B) 9× +13 = 3× +55 ?

C) 4(2× -5) = 2 (2× +6) ?

D) 3(4× -12) =2 (3× +27) ?

Alguém me ajuda por favor ?

Answer 1

a)

7x -12 = 2x + 37

7x - 2x = 37 - 12

5x = 25

x = 5

b)

9x + 13 = 3x + 55

9x - 3x = 55 - 13

6x = 42

x = 7

c)

8x - 20 = 4x + 12

8x - 4x = 12 + 20

4x = 32

x = 8

d)

12x - 36 = 6x + 54

12x - 6x = 54 + 36

6x = 90

x = 15