2(w-7)+10w=34 i dont understand how the teacher got 2 1/2

Step-by-step explanation:

1) Use the Distributive property to distribute -2 to w and -7:

-2w+14+10w=34

2) Combine alike terms (-2w and 10w):

14+8w=34

3) Subtract 14 from both sides:

8w=20

4) Divide by 8 on both sides to get x by itself:

w=20/8

5) Simplify the fraction 20/8:

5/2 or 2 1/2

i got 10.28 but that rounds up to 10.3

6e14 is the answer.