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x in (-oo:+oo)
x = (100/7)*x^5 // - (100/7)*x^5
x-((100/7)*x^5) = 0
(-100/7)*x^5+x = 0
x-100/7*x^5 = 0
x*(1-100/7*x^4) = 0
-100/7*x^4 = -1 // : -100/7
x^4 = 7/100
x^4 = 7/100 // ^ 1/4
abs(x) = (7/100)^(1/4)
x = (7/100)^(1/4) or x = -(7/100)^(1/4)
x = 0
x = 0
x in { (7/100)^(1/4), -(7/100)^(1/4), 0 }
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