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k in (-oo:+oo)
2*k+6*k+1/2 = 49/2 // - 49/2
2*k+6*k+1/2-(49/2) = 0
2*k+6*k+1/2-49/2 = 0
8*k-24 = 0 // + 24
8*k = 24 // : 8
k = 24/8
k = 3
k = 3
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