Question

Encontre o valor de y em: 10y - 5 (1 + y) = 3 (2y - 2) – 20

Answer 1

10y - 5 (1 + y) = 3 (2y - 2) – 20

10y - 5 + 5y = 6y - 6 – 20

10y - 6y + 5y = - 6 – 20 + 5

9y = - 21 ==> y = - 21/9  ou y = - 7/3

Answer 2

Resposta:

y = 21

Explicação passo-a-passo:

$10y -5(1+y)=3(2y-2)-20\\10y-5-5y=6y-6-20\\5y-5=6y-26\\5y-6y=-26+5\\-y=-21\:\times(-1)\\\boxed{y=21}$