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h in (-oo:+oo)
(2/3)*h-((1/3)*h)+11 = 8 // - 8
(2/3)*h-((1/3)*h)-8+11 = 0
(2/3)*h+(-1/3)*h-8+11 = 0
1/3*h+3 = 0 // - 3
1/3*h = -3 // : 1/3
h = -3/1/3
h = -9
h = -9
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