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h in (-oo:+oo)
18 = (40/11)*h+156/11 // - (40/11)*h+156/11
18-((40/11)*h)-(156/11) = 0
(-40/11)*h-156/11+18 = 0
42/11-40/11*h = 0 // - 42/11
-40/11*h = -42/11 // : -40/11
h = -42/11/(-40/11)
h = 21/20
h = 21/20
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