3.9=f+2.1

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Solution for 3.9=f+2.1 equation: 



3.9=f+2.1

We move all terms to the left:

3.9-(f+2.1)=0

We get rid of parentheses

-f-2.1+3.9=0

We add all the numbers together, and all the variables

-1f+1.8=0

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

-f=-1.8

f=-1.8/-1

f=1+0.8/1

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