f-15=20-6f

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Solution for f-15=20-6f equation: 



f-15=20-6f

We move all terms to the left:

f-15-(20-6f)=0

We add all the numbers together, and all the variables

f-(-6f+20)-15=0

We get rid of parentheses

f+6f-20-15=0

We add all the numbers together, and all the variables

7f-35=0

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

7f=35

f=35/7

f=5

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