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k in (-oo:+oo)
6*(-1*k-6) = 36 // - 36
6*(-1*k-6)-36 = 0
6*(-k-6)-36 = 0
6*(-k-6)-36 = 0
-6*k-72 = 0
-6*k-72 = 0
-6*k-72 = 0 // + 72
-6*k = 72 // : -6
k = 72/(-6)
k = -12
k = -12
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