3-f=3f-9

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Solution for 3-f=3f-9 equation: 



3-f=3f-9

We move all terms to the left:

3-f-(3f-9)=0

We add all the numbers together, and all the variables

-1f-(3f-9)+3=0

We get rid of parentheses

-1f-3f+9+3=0

We add all the numbers together, and all the variables

-4f+12=0

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

-4f=-12

f=-12/-4

f=+3

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