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x in (-oo:+oo)
5/4 = x/13 // - x/13
5/4-(x/13) = 0
5/4-1/13*x = 0 // - 5/4
-1/13*x = -5/4 // : -1/13
x = -5/4/(-1/13)
x = 65/4
x = 65/4
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