5x – 3y + 7 dari 5y – 3x – 4

5x-3y+7+5y-3x-4 = 5x-3y+7+5y-3x+4
=5x-3x-3y+5y+7+4
=2x+2y+11

5x-3x – 5y -3y -4 +7 = 2x – 2y + 2 🙂