15f-3=7f+21

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Solution for 15f-3=7f+21 equation: 



15f-3=7f+21

We move all terms to the left:

15f-3-(7f+21)=0

We get rid of parentheses

15f-7f-21-3=0

We add all the numbers together, and all the variables

8f-24=0

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

8f=24

f=24/8

f=3

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