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