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(1/5)*(15*y+10)-9 = (-1/3)*(3*y-27) // - (-1/3)*(3*y-27)
(1/5)*(15*y+10)-((-1/3)*(3*y-27))-9 = 0
(1/5)*(15*y+10)+(1/3)*(3*y-27)-9 = 0
1/5*(15*y+10)+1/3*(3*y-27)-9 = 0
1/5*(15*y+10)+1/3*(3*y-27)-9 = 0
4*y-9-7 = 0
4*y-16 = 0
4*y-16 = 0
4*y-16 = 0 // + 16
4*y = 16 // : 4
y = 16/4
y = 4
y = 4
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