80=20-4f

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Solution for 80=20-4f equation: 



80=20-4f

We move all terms to the left:

80-(20-4f)=0

We add all the numbers together, and all the variables

-(-4f+20)+80=0

We get rid of parentheses

4f-20+80=0

We add all the numbers together, and all the variables

4f+60=0

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

4f=-60

f=-60/4

f=-15

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