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h in (-oo:+oo)
3/14 = h/30 // - h/30
3/14-(h/30) = 0
3/14-1/30*h = 0 // - 3/14
-1/30*h = -3/14 // : -1/30
h = -3/14/(-1/30)
h = 45/7
h = 45/7
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