21f+21=42f+14

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Solution for 21f+21=42f+14 equation: 



21f+21=42f+14

We move all terms to the left:

21f+21-(42f+14)=0

We get rid of parentheses

21f-42f-14+21=0

We add all the numbers together, and all the variables

-21f+7=0

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

-21f=-7

f=-7/-21

f=1/3

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