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h in (-oo:+oo)
18 = (6/11)*h // - (6/11)*h
18-((6/11)*h) = 0
(-6/11)*h+18 = 0
18-6/11*h = 0 // - 18
-6/11*h = -18 // : -6/11
h = -18/(-6/11)
h = 33
h = 33
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