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x in (-oo:+oo)
a = (7/4)*(h-7) // - (7/4)*(h-7)
a-((7/4)*(h-7)) = 0
(-7/4)*(h-7)+a = 0
a-7/4*(h-7) = 0
a-7/4*(h-7) = 0
a-7/4*h+49/4 = 0
a-7/4*h+49/4 = 0
x belongs to the empty set
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