20=38-3f

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Solution for 20=38-3f equation: 



20=38-3f

We move all terms to the left:

20-(38-3f)=0

We add all the numbers together, and all the variables

-(-3f+38)+20=0

We get rid of parentheses

3f-38+20=0

We add all the numbers together, and all the variables

3f-18=0

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

3f=18

f=18/3

f=6

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