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x in (-oo:+oo)
33/39 = x/91 // - x/91
33/39-(x/91) = 0
11/13-1/91*x = 0 // - 11/13
-1/91*x = -11/13 // : -1/91
x = -11/13/(-1/91)
x = 77
x = 77
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