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k in (-oo:+oo)
5*k+9 = 6*k-1 // - 6*k-1
5*k-(6*k)+1+9 = 0
5*k-6*k+1+9 = 0
10-k = 0 // - 10
-k = -10 // * -1
k = 10
k = 10
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