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k in (-oo:+oo)
6*k-(2*k)-9 = -49 // + 49
6*k-(2*k)-9+49 = 0
6*k-2*k-9+49 = 0
4*k+40 = 0 // - 40
4*k = -40 // : 4
k = -40/4
k = -10
k = -10
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