x(a-d)+y(d-a)=x(a-d)-y(a-d)=(a-d)(x-y)
m²(a-2)+n(2-a)=m²(a-2)-n(a-2)=(m²-n)(a-2)
2m(x-y)-y+x=2m(x-y)+(x-y)=(2m+1)(x-y)
2n(x-y)-(y-x)=2n(x-y)+(x-y)=(2n+1)(x-y)
x(a-d)+y(d-a)=x(a-d)-y(a-d)=(a-d)(x-y)
m²(a-2)+n(2-a)=m²(a-2)-n(a-2)=(m²-n)(a-2)
2m(x-y)-y+x=2m(x-y)+(x-y)=(2m+1)(x-y)
2n(x-y)-(y-x)=2n(x-y)+(x-y)=(2n+1)(x-y)