13+16f=9f-15

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Solution for 13+16f=9f-15 equation: 



13+16f=9f-15

We move all terms to the left:

13+16f-(9f-15)=0

We get rid of parentheses

16f-9f+15+13=0

We add all the numbers together, and all the variables

7f+28=0

We move all terms containing f to the left, all other terms to the right

7f=-28

f=-28/7

f=-4

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