Question

12+(3x+6). (-7)-5=70
(com o cálculo)

Answer 1

$12+(3x+6).(-7)-5=70$

$12-5+(3x+6).(-7)=70$

$7-21x-42=70$

$-21x-35 = 70$

$-21x=70+35$

$-21x=105$

$x= -\frac{105}{21} = -5$