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h in (-oo:+oo)
18 = (6*h)/3 // - (6*h)/3
18-((6*h)/3) = 0
18-2*h = 0
18-2*h = 0 // - 18
-2*h = -18 // : -2
h = -18/(-2)
h = 9
h = 9
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