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k in (-oo:+oo)
60 = 6*k+7*k+8 // - 6*k+7*k+8
60-(6*k)-(7*k)-8 = 0
60-6*k-7*k-8 = 0
52-13*k = 0 // - 52
-13*k = -52 // : -13
k = -52/(-13)
k = 4
k = 4
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