For this case we must simplify the following expression:
[tex]4-5-2x-4y + 4-5x + 7y[/tex]
We must combine similar terms, taking into account that equal signs are added and the same sign is placed, while different signs are subtracted and the sign of the greater is placed:
[tex]4-5 + 4-2x-5x-4y + 7y =\\3-7x + 3y[/tex]
Answer:
[tex]3-7x + 3y[/tex]
