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k in (-oo:+oo)
4*k-(6*k)-7 = -29 // + 29
4*k-(6*k)-7+29 = 0
4*k-6*k-7+29 = 0
22-2*k = 0 // - 22
-2*k = -22 // : -2
k = -22/(-2)
k = 11
k = 11
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