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k in (-oo:+oo)
6*k+6 = -5*k-49 // + -5*k-49
6*k-(-5*k)+6+49 = 0
6*k+5*k+6+49 = 0
11*k+55 = 0 // - 55
11*k = -55 // : 11
k = -55/11
k = -5
k = -5
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