6=-3.9+f

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Solution for 6=-3.9+f equation: 



6=-3.9+f

We move all terms to the left:

6-(-3.9+f)=0

We add all the numbers together, and all the variables

-(f-3.9)+6=0

We get rid of parentheses

-f+3.9+6=0

We add all the numbers together, and all the variables

-1f+9.9=0

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

-f=-9.9

f=-9.9/-1

f=9+0.9/1

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