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(2/3)*(x-(18*y)) = 6*y // - 6*y
(2/3)*(x-(18*y))-(6*y) = 0
(2/3)*(x-18*y)-6*y = 0
2/3*(x-18*y)-6*y = 0
2/3*(x-18*y)-6*y = 0
2/3*x-18*y = 0
2/3*x-18*y = 0
2/3*x-18*y = 0 // + -18*y
2/3*x = -(-18*y) // : 2/3
x = (-(-18*y))/2/3
x = 27*y
x = 27*y
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