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9*x-(((5*y)/2)*y) = 7 // - 7
9*x-(((5*y)/2)*y)-7 = 0
9*x+(-5/2)*y^2-7 = 0
9*x-5/2*y^2-7 = 0 // + -5/2*y^2-7
9*x = -(-5/2*y^2-7) // : 9
x = (-(-5/2*y^2-7))/9
x = (7-(-5/2*y^2))/9
x = (7-(-5/2*y^2))/9
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