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k in (-oo:+oo)
6*k+2 = 7*k-10 // - 7*k-10
6*k-(7*k)+2+10 = 0
6*k-7*k+2+10 = 0
12-k = 0 // - 12
-k = -12 // * -1
k = 12
k = 12
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