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k in (-oo:+oo)
3*(-(7*k)-6) = 3 // - 3
3*(-(7*k)-6)-3 = 0
3*(-7*k-6)-3 = 0
3*(-7*k-6)-3 = 0
-21*k-21 = 0
-21*k-21 = 0
-21*k-21 = 0 // + 21
-21*k = 21 // : -21
k = 21/(-21)
k = -1
k = -1
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