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(-10/(-5))*x^7-(5*x^10) = 0
(-10/(-5))*x^7-5*x^10 = 0
2*x^7-5*x^10 = 0
x^7*(2-5*x^3) = 0
-5*x^3 = -2 // : -5
x^3 = 2/5
x^3 = 2/5 // ^ 1/3
x = (2/5)^(1/3)
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in { (2/5)^(1/3), 0 }
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