0=-4(f-20)

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Solution for 0=-4(f-20) equation: 



0=-4(f-20)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-4(f-20)), so:

-4(f-20)

We multiply parentheses

-4f+80

Back to the equation:

-(-4f+80)



We get rid of parentheses

4f-80=0

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

4f=80

f=80/4

f=20

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