Question

me ajudem nessas equações
a) x + 1 = 8
b) x - 4 = 3
c) 3x = 15 + 4
d) x - 7 = - 7
e) 6x = 2x - 16
f) 2x + 3 = 10 + 5
g)2(x + 3) = x + 9
h)3(2x - 4) = 2(x + 2)​

Answer 1

Resposta:

$a) \: x + 1 = 8 \\ x = 8 - 1 \\ \boxed{x = 7} \\ \\ b) \: x - 4 = 3 \\ x = 3 + 4 \\ \boxed{x = 7} \\ \\ c) \: 3x = 15 + 4 \\ 3x = 19 \\ \boxed{x = \frac{19}{3}} \\ \\ d) \: x - 7 = - 7 \\ x = - 7 + 7 \\ \boxed{x = 0} \\ \\ e) \: 6x = 2x - 16 \\ 6x - 2x = - 16 \\ 4x = - 16 \\ x = - \frac{16}{4} \\ \boxed{x = - 4} \\ \\ f) \: 2x + 3 = 10 + 5 \\ 2x = 10 + 5 - 3 \\ 2x = 12 \\ x = \frac{12}{2} \\ \boxed{x = 6} \\ \\ g) \: 2(x + 3) = x + 9 \\ 2x + 6 = x + 9 \\ 2x - x = 9 - 6 \\ \boxed{x = 3} \\ \\ h) \: 3(2x - 4) = 2(x + 2) \\ 6x - 12 = 2x + 4 \\ 6x - 2x = 4 + 12 \\ 4x = 16 \\ x = \frac{16}{4} \\ \boxed{x = 4}$