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u^4*x^3*((15*u-(3*u^3*v^4))/3) = 0
u^4*x^3*((15*u-3*u^3*v^4)/3) = 0
(u^4*x^3*(15*u-3*u^3*v^4))/3 = 0
u^4*x^3 = 0 // : u^4
x^3 = 0
x = 0
x = 0
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