20=12+4f

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Solution for 20=12+4f equation: 



20=12+4f

We move all terms to the left:

20-(12+4f)=0

We add all the numbers together, and all the variables

-(4f+12)+20=0

We get rid of parentheses

-4f-12+20=0

We add all the numbers together, and all the variables

-4f+8=0

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

-4f=-8

f=-8/-4

f=+2

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