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k in (-oo:+oo)
4 = 3*k+3*k+10 // - 3*k+3*k+10
4-(3*k)-(3*k)-10 = 0
4-3*k-3*k-10 = 0
-6*k-6 = 0 // + 6
-6*k = 6 // : -6
k = 6/(-6)
k = -1
k = -1
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