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x in (-oo:+oo)
c = (9/7)*(k-12) // - (9/7)*(k-12)
c-((9/7)*(k-12)) = 0
(-9/7)*(k-12)+c = 0
c-9/7*(k-12) = 0
c-9/7*(k-12) = 0
c-9/7*k+108/7 = 0
c-9/7*k+108/7 = 0
x belongs to the empty set
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