Question

1) Resolva as equações abaixo:
a) 2x = -7
c) - 8 + 5x = -3 + 2x + 7
e) - (x + 1) = 12 - 3 (3x - 2)
b) 3x + 2 = 2x-11
d) (x + 2) + 5 = x + 12
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Answer 1

Resposta:

A) 2x = -7

(=) x = -7/2

C) -8 + 5x = -3 + 2x + 7

(=) 5x - 2x = 8 - 3 + 7

(=) 3x = 12

(=) x = 12/3

(=) x = 4

E) - (x + 1) = 12 - 3 (3x - 2)

(=) -x - 1 = 12 - 9x + 6

(=) -x + 9x = 1 + 12 + 6

(=) 8x = 19

(=) x = 19/8

B) 3x + 2 = 2x - 11

(=) 3x - 2x = -2 - 11

(=) x = -13

D) (x + 2) + 5 = x + 12

(=) x + 2 + 5 = x + 12

(=) 2 + 5 = 12

(=) 7 = 12

(=) x = ∅

Explicação passo-a-passo: