Question

8 - Qual é o valor de x, no conjunto R, na expressão
(3 + x) -1 = (17 - 4x) - (3 + x)?
(A) ()2
(B) ( )3
(C) ( )4
(D) ( )5​

Answer 1

$\ (3 + x) -1 = (17 - 4x) - (3 + x)\\\\3 + x -1 = 17 - 4x - 3 - x\\\\x + 4x + x = 17 -3-3+1\\\\6x=12\\\\\\x=\frac{12}{6}\\\\x=2$

Resposta: a