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x in (-oo:+oo)
13/11 = x/5 // - x/5
13/11-(x/5) = 0
13/11-1/5*x = 0 // - 13/11
-1/5*x = -13/11 // : -1/5
x = -13/11/(-1/5)
x = 65/11
x = 65/11
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