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x in (-oo:+oo)
4/13 = x/52 // - x/52
4/13-(x/52) = 0
4/13-1/52*x = 0 // - 4/13
-1/52*x = -4/13 // : -1/52
x = -4/13/(-1/52)
x = 16
x = 16
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