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k in (-oo:+oo)
3-4*k = 6*k+43 // - 6*k+43
3-4*k-(6*k)-43 = 0
3-4*k-6*k-43 = 0
-10*k-40 = 0 // + 40
-10*k = 40 // : -10
k = 40/(-10)
k = -4
k = -4
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