3f+15=78

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Solution for 3f+15=78 equation: 



3f+15=78

We move all terms to the left:

3f+15-(78)=0

We add all the numbers together, and all the variables

3f-63=0

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

3f=63

f=63/3

f=21

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