2m(a+b)+a+b=2ma+2mb+a+b 2a(x+y)+x-y=2ax+2ay+x-y 4x(m-n)-m+n=4xm-4xn-m+n x(a-b)+a-b=xa-xb+a-b 5x(a+b)-a-b=5xa+5xb-a-b 4y(kp)-k+p=4yk-4yp-k+p 3m(x+y)-x+y=3mx+3my-x+y 2ax(x-y)-x-y=2ax^2-2ay--x-y x(a-b)+y(b-a)=xa-xb+yb-ya m^2(a-2)+n(2-a)=m^2a-2m^2+2n-na 2m(x-y)-y+x=2mx-2my-y+x 2n(x-y)-(y-x)=2nx-2ny-y+x