Question

Resolva as equações a seguir:

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-5y-6y=-6-20-5
10y-11y=-31
-y=-31   (-1)
y=31