Question

Resolva as equações:
a) -3x - 17 = -21
b) 2x - 8 = - 7x
c) 3x + 2 = 2x - 11​

Answer 1

Resposta:

a) -3x - 17 = -21 ⇔ -3x = -21 +17 ⇔ -3x = - 4 ⇔ x = $\frac{-4}{-3}$ ⇔ x = $\frac{4}{3}$

b) 2x - 8 = - 7x ⇔ 2x + 7x = 8 ⇔ 9x = 8 ⇔ x = $\frac{8}{9}$

c) 3x + 2 = 2x - 11​ ⇔ 3x - 2x = -11 - 2 ⇔ x = -13