21=f-13

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Solution for 21=f-13 equation: 



21=f-13

We move all terms to the left:

21-(f-13)=0

We get rid of parentheses

-f+13+21=0

We add all the numbers together, and all the variables

-1f+34=0

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

-f=-34

f=-34/-1

f=+34

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