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h in (-oo:+oo)
1639.9997 = 691.69*(1/3)*h // - 691.69*(1/3)*h
1639.9997-(691.69*(1/3)*h) = 0
1639.9997-230.56333333*h = 0
1639.9997-230.56333333*h = 0 // - 1639.9997
-230.56333333*h = -1639.9997 // : -230.56333333
h = -1639.9997/(-230.56333333)
h = 7.11301175
h = 7.11301175
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