7+21f=28+14f

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Solution for 7+21f=28+14f equation: 



7+21f=28+14f

We move all terms to the left:

7+21f-(28+14f)=0

We add all the numbers together, and all the variables

21f-(14f+28)+7=0

We get rid of parentheses

21f-14f-28+7=0

We add all the numbers together, and all the variables

7f-21=0

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

7f=21

f=21/7

f=3

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