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x in (-oo:+oo)
(3/5)*x-x-26 = 13 // - 13
(3/5)*x-x-26-13 = 0
-2/5*x-39 = 0 // + 39
-2/5*x = 39 // : -2/5
x = 39/(-2/5)
x = -195/2
x = -195/2
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