Question

Resolva as equacoes:

A) 7.(x-1) = 2.(3x + 1)

B) 2x - 8 = -7x

C) 4x - 5 = 6x + 15

D) -5m -7 -2m - 2 = 0

me ajudem por favor

Answer 1

Resposta:

a) x = 9

b) x = 8/9

c) x = - 10

d) m = - 9/7

Explicação passo-a-passo:

a) 7.( x - 1) = 2.( 3x + 1)

7x - 7 = 6x + 2

7x - 6x = 2 + 7

x = 9

b) 2x - 8 = - 7x

2x + 7x = 8

9x = 8

x = 8/9

c) 4x - 5 = 6x + 15

4x - 6x = 15 + 5

- 2x = 20

x = 20/-2

x = - 10

d) - 5m - 7 - 2m - 2 = 0

- 7m - 9 = 0

- 7m = 9

m = 9/-7

m = - 9/7