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12*w^3*x^4-(u^5*((3*x)/3)*x^2) = 0
12*w^3*x^4-(u^5*x^3) = 0
12*w^3*x^4-(u^5*x^3) = 0
x^3*(12*w^3*x-u^5) = 0
12*w^3*x-u^5 = 0 // + u^5
12*w^3*x = u^5 // : 12*w^3
x = (u^5)/(12*w^3)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (u^5)/(12*w^3), 0 }
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