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1/625 = 5^3*x-1 // - 5^3*x-1
1/625-(5^3*x)+1 = 0
626/625-125*x = 0 // - 626/625
-125*x = -626/625 // : -125
x = -626/625/(-125)
x = 626/78125
x = 626/78125
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