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(2/3)*(9*y+15)+(3/5)*(20*y-20) = 0
2/3*(9*y+15)+3/5*(20*y-20) = 0
2/3*(9*y+15)+3/5*(20*y-20) = 0
18*y-2 = 0
18*y-2 = 0
18*y-2 = 0 // + 2
18*y = 2 // : 18
y = 2/18
y = 1/9
y = 1/9
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