15(y-4)-2(y-9)+5(y+6)=0
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15 (y-4)- 2ly-9) +5 (y + 6) = 0
15y - 60 - 2y + 18+ 5y + 30 = 0
15y - 2y + 5y - 60+ 18+ 30 = 0
18y - 12 = 0
18y = 12
y = 12 18
y:2/3
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