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x in (-oo:+oo)
15/39 = x/52 // - x/52
15/39-(x/52) = 0
5/13-1/52*x = 0 // - 5/13
-1/52*x = -5/13 // : -1/52
x = -5/13/(-1/52)
x = 20
x = 20
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