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x in (-oo:+oo)
10*x^5-((5*x^7)/10) = 0
(-1/2)*x^7+10*x^5 = 0
10*x^5-1/2*x^7 = 0
x^5*(10-1/2*x^2) = 0
-1/2*x^2 = -10 // : -1/2
x^2 = 20
x^2 = 20 // ^ 1/2
abs(x) = 2*5^(1/2)
x = 2*5^(1/2) or x = -(2*5^(1/2))
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { 2*5^(1/2), -(2*5^(1/2)), 0 }
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