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K in (-oo:+oo)
(4/9)*(K-(4/7)) = 0
(4/9)*(K-4/7) = 0
4/9*(K-4/7) = 0
( 4/9 )
4/9 = 0
K belongs to the empty set
( K-4/7 )
K-4/7 = 0 // + 4/7
K = 4/7
K = 4/7
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