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2. 15x - 2y + 20x + 3y = 35x + y
3. 6x - 4 + x - y = 7x - 4 - y
4. x + y + 4y - 8 = x + 5y - 8
5. 5x - y + x - 1 = 6x - y - 1
6. x - 1 - 3x - 6 = - 2x - 7
7. 6x - 3 - 1 + x = 7x - 4
8. 18a - 13y - 5a + 4y = 13a - 9y
9. 8x - 3y - 5x + 9y = 3x + 6y
10. 10x + 10y + 10z - x - y - z = 9x + 9y + 9z
= 25a + b
2. 15x - 2y + 20x + 3y = 15x + 20x - 2y + 3y
= 35x + y
3. 6x - 4 + x - y = 6x + x - y - 4
= 7x - y - 4
4. x + y + 4y - 8 = x + 5y - 8
5. 5x - y + x - 1 = 5x + x - y - 1
= 6x - y - 1
6. x - 1 - (3x - 6) = x - 1 - 3x + 6
= x - 3x - 1 + 6
= -2x + 5
7. 6x - 3 - (1 + x) = 6x - 3 - 1 - x
= 5x - 4
8. 18a - 13y - (5a + 4y) = 18a - 13y - 5a - 4y
= 13a - 17y
9. 8x - 3y - (5x + 9y) = 8x - 3y - 5x - 9y
= 3x - 12y
10. 10x + 10y +10z - (x - y - z) = 10x + 10y + 10z - x + y + z
= 9x + 11y + 11z