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(9/2)*x = 6/y // - 6/y
(9/2)*x-(6/y) = 0
(9/2)*x-6*y^-1 = 0
9/2*x-6*y^-1 = 0 // + -6*y^-1
9/2*x = -(-6*y^-1) // : 9/2
x = (-(-6*y^-1))/9/2
x = 4/3*y^-1
x = 4/3*y^-1
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