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h in (-oo:+oo)
2 = (1/3)*h-((3/3)*h)-3 // - (1/3)*h-((3/3)*h)-3
(3/3)*h-((1/3)*h)+2+3 = 0
(-1/3)*h+(3/3)*h+2+3 = 0
2/3*h+5 = 0 // - 5
2/3*h = -5 // : 2/3
h = -5/2/3
h = -15/2
h = -15/2
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