21=f-18

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Solution for 21=f-18 equation: 



21=f-18

We move all terms to the left:

21-(f-18)=0

We get rid of parentheses

-f+18+21=0

We add all the numbers together, and all the variables

-1f+39=0

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

-f=-39

f=-39/-1

f=+39

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