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((140*x^5)/20)*x^5-32*x^4 = 0
7*x^10-32*x^4 = 0
x^4*(7*x^6-32) = 0
7*x^6 = 32 // : 7
x^6 = 32/7
x^6 = 32/7 // ^ 1/6
abs(x) = (32/7)^(1/6)
x = (32/7)^(1/6) or x = -(32/7)^(1/6)
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { (32/7)^(1/6), -(32/7)^(1/6), 0 }
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