Question

1. Resolva as equações do 1° grau: a) 3 –2(x + 3) = x – 18 b) 50 + (3x − 4) = 2(3x – 4) + 26] c) 4(x + 3) – x = 24 + x

Answer 1

Resposta:

a)

$3 - 2x \times - 6 = x - 18 \\ - 2x - x = - 18 + 3 \\ - 3x = - 15( - 1) \\ 3x = 15 \\ x = \frac{15}{ 3} \\ x = 5$

b)

$50 + 3x - 4 = 6x - 8 + 26 \\ 3x - 6x = + 18 - 46 \\ - 3x = - 28( - 1) \\ 3x = 28 \\ \times = \frac{28}{3}$

c)

$4x + 12 - x = 24 + x \\ 4x = 12 \\ x = \frac{12}{4} \\ x = 3$