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(1/3)*(y-6) = (2/9)*(y+18) // - (2/9)*(y+18)
(1/3)*(y-6)-((2/9)*(y+18)) = 0
(1/3)*(y-6)+(-2/9)*(y+18) = 0
1/3*(y-6)-2/9*(y+18) = 0
1/3*(y-6)-2/9*(y+18) = 0
1/9*y-6 = 0
1/9*y-6 = 0
1/9*y-6 = 0 // + 6
1/9*y = 6 // : 1/9
y = 6/1/9
y = 54
y = 54
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