3=12-f

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Solution for 3=12-f equation: 



3=12-f

We move all terms to the left:

3-(12-f)=0

We add all the numbers together, and all the variables

-(-1f+12)+3=0

We get rid of parentheses

1f-12+3=0

We add all the numbers together, and all the variables

f-9=0

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

f=9

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