7x+3xy-7x -6x+5x-x -2x-8x+4x -15x+13x -6xy+3xy+6xy 12x²y-5x²y-10x²y 5xy-9xy+7xy -10xy+2x+13xy-2x -16x²y+5x²y+8x²y 6x+3x+10x -6x+3x+10x

7x+3xy-7x = 3xy -6x+5x-x = -2x -2x-8x+4x = -6x -15x+13x = -2x -6xy+3xy+6xy = 3xy 12x²y-5x²y-10x²y = -3x²y 5xy-9xy+7xy = 3xy -10xy+2x+13xy-2x = 3xy -16x²y+5x²y+8x²y = -3x²y 6x+3x+10x = 19x -6x+3x+10x = 7x