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k in (-oo:+oo)
k/6 = -3/2 // + -3/2
k/6-(-3/2) = 0
k/6+3/2 = 0
1/6*k+3/2 = 0 // - 3/2
1/6*k = -3/2 // : 1/6
k = -3/2/1/6
k = -9
k = -9
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