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x in (-oo:+oo)
1/5 = 25*x // - 25*x
1/5-(25*x) = 0
1/5-25*x = 0
1/5-25*x = 0 // - 1/5
-25*x = -1/5 // : -25
x = -1/5/(-25)
x = 1/125
x = 1/125
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