kx^2+(2k-3)x+k-3
=(kx+k-3)(x+1)
x^2+(n-2m)x+m^2-mn
= x^2+(n-2m)x -m(n-m)
= (x-m)(x+n-m)
kx^2+(3k+1)x+2k+1
= (kx+2k+1)(k+1)
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