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h in (-oo:+oo)
2/21 = h/39 // - h/39
2/21-(h/39) = 0
2/21-1/39*h = 0 // - 2/21
-1/39*h = -2/21 // : -1/39
h = -2/21/(-1/39)
h = 26/7
h = 26/7
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