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x in (-oo:+oo)
26 = (-13/25)*x // - (-13/25)*x
26-((-13/25)*x) = 0
(13/25)*x+26 = 0
13/25*x+26 = 0 // - 26
13/25*x = -26 // : 13/25
x = -26/13/25
x = -50
x = -50
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