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x in (-oo:+oo)
77 = (x/100)^99 // - (x/100)^99
77-(x/100)^99 = 0
-1*x^99 = -77 // : -1
x^99 = 77
x^99 = 77 // ^ 1/99
x = 77^(1/99)
x = 77^(1/99)
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