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k in (-oo:+oo)
(3*k)/2+2/6 = 7/12 // - 7/12
(3*k)/2+2/6-(7/12) = 0
(3*k)/2+2/6-7/12 = 0
3/2*k-1/4 = 0 // + 1/4
3/2*k = 1/4 // : 3/2
k = 1/4/3/2
k = 1/6
k = 1/6
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