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X in (-oo:+oo)
-13 = (-1/25)*X // - (-1/25)*X
-((-1/25)*X)-13 = 0
(1/25)*X-13 = 0
1/25*X-13 = 0 // + 13
1/25*X = 13 // : 1/25
X = 13/1/25
X = 325
X = 325
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