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x in (-oo:+oo)
-8/13 = x+2/13 // - x+2/13
-x-8/13-(2/13) = 0
-x-8/13-2/13 = 0
-x-10/13 = 0 // + 10/13
-x = 10/13 // * -1
x = -10/13
x = -10/13
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