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h in (-oo:+oo)
3/28 = h/52 // - h/52
3/28-(h/52) = 0
3/28-1/52*h = 0 // - 3/28
-1/52*h = -3/28 // : -1/52
h = -3/28/(-1/52)
h = 39/7
h = 39/7
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