-5=21+f

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Solution for -5=21+f equation: 



-5=21+f

We move all terms to the left:

-5-(21+f)=0

We add all the numbers together, and all the variables

-(f+21)-5=0

We get rid of parentheses

-f-21-5=0

We add all the numbers together, and all the variables

-1f-26=0

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

-f=26

f=26/-1

f=-26

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