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x in (-oo:+oo)
H = (5/6)*(a-9) // - (5/6)*(a-9)
H-((5/6)*(a-9)) = 0
(-5/6)*(a-9)+H = 0
H-5/6*(a-9) = 0
H-5/6*(a-9) = 0
H-5/6*a+15/2 = 0
H-5/6*a+15/2 = 0
x belongs to the empty set
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