57=21+2f

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Solution for 57=21+2f equation: 



57=21+2f

We move all terms to the left:

57-(21+2f)=0

We add all the numbers together, and all the variables

-(2f+21)+57=0

We get rid of parentheses

-2f-21+57=0

We add all the numbers together, and all the variables

-2f+36=0

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

-2f=-36

f=-36/-2

f=+18

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