2f+12=3-f

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Solution for 2f+12=3-f equation: 



2f+12=3-f

We move all terms to the left:

2f+12-(3-f)=0

We add all the numbers together, and all the variables

2f-(-1f+3)+12=0

We get rid of parentheses

2f+1f-3+12=0

We add all the numbers together, and all the variables

3f+9=0

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

3f=-9

f=-9/3

f=-3

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