Question

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

Answer 1

10y-5+5y=6y-6-20 -> 10y+5y-6y=-6-20+5. 9y=-21 -> Y= -21÷9

Answer 2

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