3f=4f+9

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Solution for 3f=4f+9 equation: 



3f=4f+9

We move all terms to the left:

3f-(4f+9)=0

We get rid of parentheses

3f-4f-9=0

We add all the numbers together, and all the variables

-1f-9=0

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

-f=9

f=9/-1

f=-9

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