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h in (-oo:+oo)
8-((2/3)*h) = -12 // + 12
8-((2/3)*h)+12 = 0
(-2/3)*h+8+12 = 0
20-2/3*h = 0 // - 20
-2/3*h = -20 // : -2/3
h = -20/(-2/3)
h = 30
h = 30
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