Question

10y-5(1+y)=3(2y-2)-20

Answer 1

10y-5+5y=6y-6-20
10y+5y-6y=5+6+20
15y-6y=11+20
9y=21

Answer 2

Resposta:

y = 21

Explicação passo-a-passo:

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