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((12*u^4)/12)*u^4*v^4-(15*u^3*x^3) = 0
((12*u^4)/12)*u^4*v^4-15*u^3*x^3 = 0
-15*u^3*x^3 = -(u^8*v^4) // : -15*u^3
x^3 = (-1/15)*u^5*v^4
x^3 = -1/15*u^5*v^4 // ^ 1/3
x = -(1/15)^(1/3)*u^(5/3)*v^(4/3)
x = -(1/15)^(1/3)*u^(5/3)*v^(4/3)
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