Question

15(y - 4)- 2(y - 9) + 5(y + 6) = 0

Answer 1

15y-60-2y+18+5y+30=0
15y-2y+5y+30+18-60=0
18y+48-60=0
18y-12=0
18y=12
y=12/18=2/3

Answer 2

15(y-4)-2(y-9)+5(y+6)=0
15y-60-2y-18+5y+30=0

combine like terms
(15y-2y+5y)+(-60+18+30)=0

18y-12=0
isolate y,
18y=0+12=12
18y=12
y=12/18

simplify=2/3
 answer is 2/3