20=8+4f

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Solution for 20=8+4f equation: 



20=8+4f

We move all terms to the left:

20-(8+4f)=0

We add all the numbers together, and all the variables

-(4f+8)+20=0

We get rid of parentheses

-4f-8+20=0

We add all the numbers together, and all the variables

-4f+12=0

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

-4f=-12

f=-12/-4

f=+3

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