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x in (-oo:+oo)
10*y = ((2*x)/3)*x^2 // - ((2*x)/3)*x^2
10*y-(((2*x)/3)*x^2) = 0
(-2/3)*x^3+10*y = 0
-2/3*x^3 = -(10*y) // : -2/3
x^3 = 15*y
x^3 = 15*y // ^ 1/3
x = 15^(1/3)*y^(1/3)
x = 15^(1/3)*y^(1/3)
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