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h in (-oo:+oo)
25.12 = 12.56*(1/3)*h // - 12.56*(1/3)*h
25.12-(12.56*(1/3)*h) = 0
25.12-4.18666667*h = 0
25.12-4.18666667*h = 0 // - 25.12
-4.18666667*h = -25.12 // : -4.18666667
h = -25.12/(-4.18666667)
h = 6
h = 6
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