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k in (-oo:+oo)
4*k+9 = 5*k+16 // - 5*k+16
4*k-(5*k)-16+9 = 0
4*k-5*k-16+9 = 0
-k-7 = 0 // + 7
-k = 7 // * -1
k = -7
k = -7
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