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h in (-oo:+oo)
2/21 = h/24 // - h/24
2/21-(h/24) = 0
2/21-1/24*h = 0 // - 2/21
-1/24*h = -2/21 // : -1/24
h = -2/21/(-1/24)
h = 16/7
h = 16/7
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