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k in (-oo:+oo)
6*(-(3*k)-2) = -84 // + 84
6*(-(3*k)-2)+84 = 0
6*(-3*k-2)+84 = 0
6*(-3*k-2)+84 = 0
72-18*k = 0
72-18*k = 0
72-18*k = 0 // - 72
-18*k = -72 // : -18
k = -72/(-18)
k = 4
k = 4
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