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x in (-oo:+oo)
A = (7/5)*(h-56) // - (7/5)*(h-56)
A-((7/5)*(h-56)) = 0
(-7/5)*(h-56)+A = 0
A-7/5*(h-56) = 0
A-7/5*(h-56) = 0
A-7/5*h+392/5 = 0
A-7/5*h+392/5 = 0
x belongs to the empty set
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