Question

Considerando A+x-6; B=2x-1; C=4x+7. Qual o o valor de A+B+C?

Answer 1

$A = x - 6 \\ \\ B = 2x - 1 \\ \\ C = 4x + 7$

A + B + C

$x - 6 + 2x - 1 + 4x + 7 = 0 \\ \\ x - 6 + 6x + 6 = 0 \\ \\ x + 6x = 0 \\ \\ 7x = 0 \\ \\ x = - 7$