Question

Resolva as equações.

a) 3x = - 45 - 2x


b) 6 (x + 3) - 2 (x - 5) = 20


c) - 18 = 2x + 15


d) 2 ( x - 1) - 1 = 8​

Answer 1

Resposta:

$a)3x = - 45 - 2x \\ 3x + 2x = - 45 \\ 5x = - 45 \\ x = \frac{ - 45}{5} = \\ x = - 9$

$b)6(x + 3) - 2(x - 5) = 20 \\ 6x + 18 - 2x + 10 = 20 \\ 6x - 2x = 20 - 10 - 18 \\ 4x = - 8 \\ x = \frac{ - 8}{4} = \\ x = - 2$

$c) - 18 = 2x + 15 \\ - 2x = 15 + 18 \\ - 2x = 33 \\ x = \frac{33}{ - 2}$

d)2(x-1)-1=8

2x-2-1=8

2X=8-2-1

2x=5

x=5

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2