Question

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

Answer 1

10y -5 -5y = 6y -6 -20
5y -5 = 6y -26
y = 21

Answer 2

10y -5 (1+y) = 3 (2y - 2) - 20
10y -5 -5y = 6y - 6 - 20
10y -5y -6y = -6 -20 +5
-y = -21 .(-1)
y = 21
Espero ter ajudado!