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x in (-oo:+oo)
C = (9/7)*(k-89) // - (9/7)*(k-89)
C-((9/7)*(k-89)) = 0
(-9/7)*(k-89)+C = 0
C-9/7*(k-89) = 0
C-9/7*(k-89) = 0
C-9/7*k+801/7 = 0
C-9/7*k+801/7 = 0
x belongs to the empty set
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