f+9=4f

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Solution for f+9=4f equation: 



f+9=4f

We move all terms to the left:

f+9-(4f)=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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