Question

Resolva as equações a seguir
A) 6x-4+2x = -12x-6+4
B) 3 (2x+4) = 7x-8
C) 2 (5x+9) = 4x-7+21

Answer 1

Resposta:

$a) 6x - 4 + 2x = - 12x - 6 + 4 \\ 6x + 2x + 12x = - 6 + 4 + 4 \\ 20x = 2 \\ x = \frac{2}{20} \\ b) 3(2x + 4) = 7x - 8 \\ 6x + 12 = 7x - 8 \\ 6x - 7x = - 8 - 12 \\ - x = - 20 \\ x = 20 \\ c)2(5x + 9) = 4x - 7 + 21 \\ 10x + 18 = 4x - 7 + 21 \\ 10x - 4x = - 7 + 21 - 18 \\ 6x = - 4 \\ x \frac{ - 4}{ 6} x \frac{ - 2}{3}$