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25 = (10/40)*x^100 // - (10/40)*x^100
25-((10/40)*x^100) = 0
(-1/4)*x^100+25 = 0
-1/4*x^100 = -25 // : -1/4
x^100 = 100
x^100 = 100 // ^ 1/100
abs(x) = 100^(1/100)
x = 100^(1/100) or x = -100^(1/100)
x in { 100^(1/100), -100^(1/100) }
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