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## Sagot :

**Answer:**

1) 16x-2

2) 15x-2

3) 7

**Step-by-step explanation:**

1) (9x+4)+(7x−6)

9x+4+7x-6

9x+7x+4-6

16x+4-6

16x-2

2) (12x+5)+(3x−7)

12x+5+3x-7

12x+3x+5-7

15x+5-7

15x-2

3) 7y+15-7y-8

7y-7y+15-8

15-8

7