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K in (-oo:+oo)
3*(4*K-(1/3)) = 0
3*(4*K-1/3) = 0
( 3 )
3 = 0
K belongs to the empty set
( 4*K-1/3 )
4*K-1/3 = 0 // + 1/3
4*K = 1/3 // : 4
K = 1/3/4
K = 1/12
K = 1/12
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