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Y in (-oo:+oo)
Y = (1/2)*(4-2)*(4-8) // - (1/2)*(4-2)*(4-8)
Y-((1/2)*(4-2)*(4-8)) = 0
Y+(-1/2)*(4-2)*(4-8) = 0
Y+4 = 0 // - 4
Y = -4
Y = -4
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