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x in (-oo:+oo)
H = (7/6)*(a-9) // - (7/6)*(a-9)
H-((7/6)*(a-9)) = 0
(-7/6)*(a-9)+H = 0
H-7/6*(a-9) = 0
H-7/6*(a-9) = 0
H-7/6*a+21/2 = 0
H-7/6*a+21/2 = 0
x belongs to the empty set
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