Question

Alguém me ajude,por favor!
preciso do passo a passo!​

Answer 1

$4 \cdot (x + 6) = -x - 21\\4 \cdot x + 4 \cdot 6 = - x - 21\\4 \cdot x + 24 = - x - 21\\4 \cdot x + x + 24 = -21\\4 \cdot x + x = - 21 - 24\\5 \cdot x = -21 - 24\\5 \cdot x = -45\\x = \frac{-45}{5}\\\boldsymbol{x = -9}$

$15 + (2 \cdot x - 5) = 3 \cdot (2 \cdot x - 2)\\15 + 2 \cdot x - 5 = 3 \cdot 2 \cdot x + 3 \cdot (-2)\\15 + 2 \cdot x - 5 = 6 \cdot x + 3 \cdot (-2)\\15 + 2 \cdot x - 5 = 6 \cdot x - 6\\10 + 2 \cdot x = 6 \cdot x - 6\\2 \cdot x - 6 \cdot x = - 6 - 10\\-4 \cdot x = -16\\x = \frac{-16}{-4}\\\boldsymbol{x = 4}$

Resposta: d) -9 e 4

Answer 2

Resposta:

Letra D

Explicação passo-a-passo:

Vamos lá!

$4(x+6)=-x-21=\\\\4x+24=-x-21\\\\4x+x=-21-24\\\\5x=-45\\\\x=-45/5\\\\x=-9\\\\\\15+(2x-5)=3(2x-2)\\\\15+2x-5=6x-6\\\\10+2x=6x-6\\\\2x-6x=-6-10\\\\-4x=-16\\\\x=16/4\\\\x=4$

Prof Alexandre