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x in (-oo:+oo)
8/52 = x/39 // - x/39
8/52-(x/39) = 0
2/13-1/39*x = 0 // - 2/13
-1/39*x = -2/13 // : -1/39
x = -2/13/(-1/39)
x = 6
x = 6
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