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x in (-oo:+oo)
(-1/4)*x-((4/5)*x^20) = 0
(-4/5)*x^20+(-1/4)*x = 0
-4/5*x^20-1/4*x = 0
-x*(4/5*x^19+1/4) = 0
4/5*x^19 = -1/4 // : 4/5
x^19 = -5/16
x^19 = -5/16 // ^ 1/19
x = -(5/16)^(1/19)
-x = 0
-1*x = 0 // : -1
x = 0
x in { -(5/16)^(1/19), 0 }
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