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x in (-oo:+oo)
c = (8/7)*(k-64) // - (8/7)*(k-64)
c-((8/7)*(k-64)) = 0
(-8/7)*(k-64)+c = 0
c-8/7*(k-64) = 0
c-8/7*(k-64) = 0
c-8/7*k+512/7 = 0
c-8/7*k+512/7 = 0
x belongs to the empty set
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