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x in (-oo:+oo)
2/13 = (8/13)*x+4/13 // - (8/13)*x+4/13
2/13-((8/13)*x)-(4/13) = 0
(-8/13)*x+2/13-4/13 = 0
-8/13*x-2/13 = 0 // + 2/13
-8/13*x = 2/13 // : -8/13
x = 2/13/(-8/13)
x = -1/4
x = -1/4
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