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x in (-oo:+oo)
(7^0)/(7^5) = x // - x
(7^0)/(7^5)-x = 0
1/(7^5)-x = 0
1/16807-x = 0 // - 1/16807
-x = -1/16807 // * -1
x = 1/16807
x = 1/16807
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