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h in (-oo:+oo)
2/21 = h/54 // - h/54
2/21-(h/54) = 0
2/21-1/54*h = 0 // - 2/21
-1/54*h = -2/21 // : -1/54
h = -2/21/(-1/54)
h = 36/7
h = 36/7
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