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x in (-oo:+oo)
100-((50/5)*x^10) = 0
100-10*x^10 = 0
-10*x^10 = -100 // : -10
x^10 = 10
x^10 = 10 // ^ 1/10
abs(x) = 10^(1/10)
x = 10^(1/10) or x = -10^(1/10)
x in { 10^(1/10), -10^(1/10) }
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