6f+21=15

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Solution for 6f+21=15 equation: 



6f+21=15

We move all terms to the left:

6f+21-(15)=0

We add all the numbers together, and all the variables

6f+6=0

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

6f=-6

f=-6/6

f=-1

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