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h in (-oo:+oo)
3/14 = h/140 // - h/140
3/14-(h/140) = 0
3/14-1/140*h = 0 // - 3/14
-1/140*h = -3/14 // : -1/140
h = -3/14/(-1/140)
h = 30
h = 30
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