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k in (-oo:+oo)
4*(3*k+4) = 40 // - 40
4*(3*k+4)-40 = 0
4*(3*k+4)-40 = 0
12*k-24 = 0
12*k-24 = 0
12*k-24 = 0 // + 24
12*k = 24 // : 12
k = 24/12
k = 2
k = 2
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