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x in (-oo:+oo)
8/13 = x/6 // - x/6
8/13-(x/6) = 0
8/13-1/6*x = 0 // - 8/13
-1/6*x = -8/13 // : -1/6
x = -8/13/(-1/6)
x = 48/13
x = 48/13
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