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k in (-oo:+oo)
6 = -k/3-6 // + -k/3-6
6-(-k/3)+6 = 0
(1/3)*k+6+6 = 0
1/3*k+12 = 0 // - 12
1/3*k = -12 // : 1/3
k = -12/1/3
k = -36
k = -36
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