21f+98=39f-100

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Solution for 21f+98=39f-100 equation: 



21f+98=39f-100

We move all terms to the left:

21f+98-(39f-100)=0

We get rid of parentheses

21f-39f+100+98=0

We add all the numbers together, and all the variables

-18f+198=0

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

-18f=-198

f=-198/-18

f=+11

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