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x in (-oo:+oo)
15/6 = x/13 // - x/13
15/6-(x/13) = 0
5/2-1/13*x = 0 // - 5/2
-1/13*x = -5/2 // : -1/13
x = -5/2/(-1/13)
x = 65/2
x = 65/2
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