Question

10y-5[1 +y ]=3 [2y-2]-20

Answer 1

10y-5[1+y] = 3[2y-2] - 20
10y-5y-5 = 6y-6-20
10y-5y-6y = -6-20+5
-y = -21 *(-1)

y = 21

Answer 2

10Y-5+5Y=6y-6-20
15Y-6Y=-26+5
9Y=-21
Y=-21/9
Y=2,333333...