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k in (-oo:+oo)
5*k+7 = -5*k-113 // + -5*k-113
5*k-(-5*k)+7+113 = 0
5*k+5*k+7+113 = 0
10*k+120 = 0 // - 120
10*k = -120 // : 10
k = -120/10
k = -12
k = -12
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