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k in (-oo:+oo)
3*k+10 = 7*k+6 // - 7*k+6
3*k-(7*k)-6+10 = 0
3*k-7*k-6+10 = 0
4-4*k = 0 // - 4
-4*k = -4 // : -4
k = -4/(-4)
k = 1
k = 1
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