2x+7y-3x+5-2y-x= -2x+5y+5
5x-2y+5-4y-x+y= 4x-5y+5
3(-2x)+(-3)y+5+4x=-6x-3y+5+4x=-2x-3y+5
5(-y)-8x+7×(-1)+2+2x= -6x-5y-5
2(-2y)+2x-5(-2y)-7+2+3x=5x+6y-5
