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x in (-oo:+oo)
h = (7/10)*(220-a) // - (7/10)*(220-a)
h-((7/10)*(220-a)) = 0
(-7/10)*(220-a)+h = 0
h-7/10*(220-a) = 0
h-7/10*(220-a) = 0
7/10*a+h-154 = 0
7/10*a+h-154 = 0
x belongs to the empty set
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