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(2/3)*x-4 = y // - y
(2/3)*x-y-4 = 0
2/3*x-y-4 = 0 // + -y-4
2/3*x = -(-y-4) // : 2/3
x = (-(-y-4))/2/3
x = 3/2*(y+4)
x = 3/2*(y+4)
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