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k in (-oo:+oo)
4*k+3 = 69-2*k // - 69-2*k
4*k-(-2*k)-69+3 = 0
4*k+2*k-69+3 = 0
6*k-66 = 0 // + 66
6*k = 66 // : 6
k = 66/6
k = 11
k = 11
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