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h in (-oo:+oo)
7/3 = h/18 // - h/18
7/3-(h/18) = 0
7/3-1/18*h = 0 // - 7/3
-1/18*h = -7/3 // : -1/18
h = -7/3/(-1/18)
h = 42
h = 42
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