Question

Resolva as equações
A)-39+2x=-25
B)-30+5x=-30
F)105+x=72

Answer 1

a) 7, b) 0, f) -33

Soluções:

A)

$-39+2x=-25\\2x=-25+39\\2x=14\\x=\frac{14}{2}\\x=7$

B)

$-30+5x=-30\\5x=-30+30\\5x=0\\x=0$

F)

$105+x=72\\x=72-105\\x=-33$

Prova real:

$-39+14=-25$

$-30+0=-30$

$105+(-33)=72\\105-33=72$