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x in (-oo:+oo)
8/5 = x/13 // - x/13
8/5-(x/13) = 0
8/5-1/13*x = 0 // - 8/5
-1/13*x = -8/5 // : -1/13
x = -8/5/(-1/13)
x = 104/5
x = 104/5
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