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k in (-oo:+oo)
4*k-9 = 7*k+15 // - 7*k+15
4*k-(7*k)-15-9 = 0
4*k-7*k-15-9 = 0
-3*k-24 = 0 // + 24
-3*k = 24 // : -3
k = 24/(-3)
k = -8
k = -8
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