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(1/9)*(9*y+18)-9 = (-1/3)*(9*y-15) // - (-1/3)*(9*y-15)
(1/9)*(9*y+18)-((-1/3)*(9*y-15))-9 = 0
(1/9)*(9*y+18)+(1/3)*(9*y-15)-9 = 0
1/9*(9*y+18)+1/3*(9*y-15)-9 = 0
1/9*(9*y+18)+1/3*(9*y-15)-9 = 0
4*y-9-3 = 0
4*y-12 = 0
4*y-12 = 0
4*y-12 = 0 // + 12
4*y = 12 // : 4
y = 12/4
y = 3
y = 3
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