5f-21=2f+15

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Solution for 5f-21=2f+15 equation: 



5f-21=2f+15

We move all terms to the left:

5f-21-(2f+15)=0

We get rid of parentheses

5f-2f-15-21=0

We add all the numbers together, and all the variables

3f-36=0

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

3f=36

f=36/3

f=12

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