Question

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

Answer 1

10y - 5 - 5y = 6y -6 -20
10y - 5y - 6y = -6 - 20 +5
-y = -21 (-1)
y = 21               ok

Answer 2

Resposta:

y = 21

Explicação passo-a-passo:

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