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h in (-oo:+oo)
120 = (3.14*6^2*h)/3 // - (3.14*6^2*h)/3
120-((3.14*6^2*h)/3) = 0
120-1.04666667*6^2*h = 0
120-37.68000012*h = 0 // - 120
-37.68000012*h = -120 // : -37.68000012
h = -120/(-37.68000012)
h = 3.18471337
h = 3.18471337
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