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h in (-oo:+oo)
2/21 = h/45 // - h/45
2/21-(h/45) = 0
2/21-1/45*h = 0 // - 2/21
-1/45*h = -2/21 // : -1/45
h = -2/21/(-1/45)
h = 30/7
h = 30/7
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