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k in (-oo:+oo)
k+10 = -6*k-39 // + -6*k-39
k-(-6*k)+10+39 = 0
k+6*k+10+39 = 0
7*k+49 = 0 // - 49
7*k = -49 // : 7
k = -49/7
k = -7
k = -7
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