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k in (-oo:+oo)
(1/5)*(2*4*k-k-3) = 4 // - 4
(1/5)*(2*4*k-k-3)-4 = 0
1/5*(7*k-3)-4 = 0
1/5*(7*k-3)-4 = 0
7/5*k-23/5 = 0
7/5*k-23/5 = 0
7/5*k-23/5 = 0 // + 23/5
7/5*k = 23/5 // : 7/5
k = 23/5/7/5
k = 23/7
k = 23/7
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