21+6f=7f+14

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Solution for 21+6f=7f+14 equation: 



21+6f=7f+14

We move all terms to the left:

21+6f-(7f+14)=0

We get rid of parentheses

6f-7f-14+21=0

We add all the numbers together, and all the variables

-1f+7=0

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

-f=-7

f=-7/-1

f=+7

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