Question

Resolva as equações 4(×+5)+3(x+5)=21

Answer 1

4(x + 5) + 3(x + 5) = 21
4x + 20 + 3x + 15 = 21
4x + 3x + 20 + 15 = 21
7x + 35 = 21
7x = 21 - 35
7x = -14
x = -14/2
x = -2

Resposta: x = -2

Answer 2

$4(x+5)+3(x+5)=21 \\ 4x+20+3x+15=21 \\ 7x+35=21 \\ 7x=21-35 \\ 7x=-14 \\ x= \frac{-14}{7} \\ x=-2$