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x in (-oo:+oo)
11/13 = x/4 // - x/4
11/13-(x/4) = 0
11/13-1/4*x = 0 // - 11/13
-1/4*x = -11/13 // : -1/4
x = -11/13/(-1/4)
x = 44/13
x = 44/13
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