the Answer

The Answer -  This answer from the exercise here. In this answer will be more explanation details. You can see details answer below :

1. 5x + 3y + 2xy = 5x + 3y + 2xy

2. 3x + 2x = 5x

3. 5x + 2y - 20x + 10y = 5x - 20x + 2y + 10y
                                   = -15x       + 12y

4. xy + x + 2y = 1xy + 1x + 2y = xy + x 2y

5. 9x + 3y + 1x = 9x + 1x + 3y = 10x + 3y

6. -3xy + 2y + 5xy = -3xy + 5xy + 2y 
                            = 2xy + 2y

7. x + y = 1x + 1y = x + y

8. 7xy - 5y + xy = 7xy - 5y + 1xy = 7xy + 1xy - 5y
                         = 8xy - 5y

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