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x in (-oo:+oo)
8/13 = x/9 // - x/9
8/13-(x/9) = 0
8/13-1/9*x = 0 // - 8/13
-1/9*x = -8/13 // : -1/9
x = -8/13/(-1/9)
x = 72/13
x = 72/13
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