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8*x-(3*x)+y*((3*y^2)/4) = 0
8*x-3*x+y*((3*y^2)/4) = 0
5*x+3/4*y^3 = 0 // - 3/4*y^3
5*x = -(3/4*y^3) // : 5
x = (-(3/4*y^3))/5
x = -3/20*y^3
x = -3/20*y^3
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