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x in (-oo:+oo)
A = (5/3)*(h-42) // - (5/3)*(h-42)
A-((5/3)*(h-42)) = 0
(-5/3)*(h-42)+A = 0
A-5/3*(h-42) = 0
A-5/3*(h-42) = 0
A-5/3*h+70 = 0
A-5/3*h+70 = 0
x belongs to the empty set
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