100=80+4f

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Solution for 100=80+4f equation: 



100=80+4f

We move all terms to the left:

100-(80+4f)=0

We add all the numbers together, and all the variables

-(4f+80)+100=0

We get rid of parentheses

-4f-80+100=0

We add all the numbers together, and all the variables

-4f+20=0

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

-4f=-20

f=-20/-4

f=+5

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