3f+15=5f+21

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Solution for 3f+15=5f+21 equation: 



3f+15=5f+21

We move all terms to the left:

3f+15-(5f+21)=0

We get rid of parentheses

3f-5f-21+15=0

We add all the numbers together, and all the variables

-2f-6=0

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

-2f=6

f=6/-2

f=-3

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