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n in (-oo:+oo)
5^10*n-15 = 1/625 // - 1/625
5^10*n-(1/625)-15 = 0
5^10*n-1/625-15 = 0
9765625*n-9376/625 = 0 // + 9376/625
9765625*n = 9376/625 // : 9765625
n = 9376/625/9765625
n = 9376/6103515625
n = 9376/6103515625
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