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x in (0:+oo)
49*x^(-5/8)-(((8/7)*x^7)/8) = 0
(-1/7)*x^7+49*x^(-5/8) = 0
49*x^(-5/8)-1/7*x^7 = 0
x^(-5/8)*(49-1/7*x^(61/8)) = 0
-1/7*x^(61/8) = -49 // : -1/7
x^(61/8) = 343
x^(61/8) = 343 // ^ 8
x^61 = 191581231380566414401 // ^ 1/61
x = 191581231380566414401^(1/61)
1/(x^(5/8)) = 0
1*x^(-5/8) = 0 // : 1
x^(-5/8) = 0
x należy do O
x = 191581231380566414401^(1/61)
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