4f=45-f

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Solution for 4f=45-f equation: 



4f=45-f

We move all terms to the left:

4f-(45-f)=0

We add all the numbers together, and all the variables

4f-(-1f+45)=0

We get rid of parentheses

4f+1f-45=0

We add all the numbers together, and all the variables

5f-45=0

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

5f=45

f=45/5

f=9

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