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k in (-oo:+oo)
6*(2*k-3) = -66 // + 66
6*(2*k-3)+66 = 0
6*(2*k-3)+66 = 0
12*k+48 = 0
12*k+48 = 0
12*k+48 = 0 // - 48
12*k = -48 // : 12
k = -48/12
k = -4
k = -4
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