7 +5+-3= 2x-xy+3x-3xy=

7 + 5 – 3= 9
2x – xy + 3x – 3xy = (2-3)x + (-1 – (-3))xy
= -x +2xy

7+5+_3=9
2x-xy+3x-3xy=2x+3x-xy-3xy=5x-4xy