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k in (-oo:+oo)
5*k-1 = 119-7*k // - 119-7*k
5*k-(-7*k)-119-1 = 0
5*k+7*k-119-1 = 0
12*k-120 = 0 // + 120
12*k = 120 // : 12
k = 120/12
k = 10
k = 10
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