20=f-21

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Solution for 20=f-21 equation: 



20=f-21

We move all terms to the left:

20-(f-21)=0

We get rid of parentheses

-f+21+20=0

We add all the numbers together, and all the variables

-1f+41=0

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

-f=-41

f=-41/-1

f=+41

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