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k in (-oo:+oo)
3-(6*k)-(4*k) = -97 // + 97
3-(6*k)-(4*k)+97 = 0
3-6*k-4*k+97 = 0
100-10*k = 0 // - 100
-10*k = -100 // : -10
k = -100/(-10)
k = 10
k = 10
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