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x in (-oo:+oo)
1/25 = 125*x // - 125*x
1/25-(125*x) = 0
1/25-125*x = 0
1/25-125*x = 0 // - 1/25
-125*x = -1/25 // : -125
x = -1/25/(-125)
x = 1/3125
x = 1/3125
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