3f=-f+28

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Solution for 3f=-f+28 equation: 



3f=-f+28

We move all terms to the left:

3f-(-f+28)=0

We add all the numbers together, and all the variables

3f-(-1f+28)=0

We get rid of parentheses

3f+1f-28=0

We add all the numbers together, and all the variables

4f-28=0

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

4f=28

f=28/4

f=7

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