Match 1234 to abcd

1. 5x + 5y - 5

2. 2x + 9y - 7x + 5 - 4y - 10

3. 5x + 10y - 10x + 5y - 15 + 20

4. - 5 + 10x - 7y + 10 - 3y + 5x

a. - 5x + 5y - 5

b. = - 5x + 15y + 5

c. = 15x - 10y + 5

d. 5x + 5y - 5

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