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k in (-oo:+oo)
2*k+6 = 7*k+31 // - 7*k+31
2*k-(7*k)-31+6 = 0
2*k-7*k-31+6 = 0
-5*k-25 = 0 // + 25
-5*k = 25 // : -5
k = 25/(-5)
k = -5
k = -5
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