-20-f-20=20+3f

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Solution for -20-f-20=20+3f equation: 



-20-f-20=20+3f

We move all terms to the left:

-20-f-20-(20+3f)=0

We add all the numbers together, and all the variables

-f-(3f+20)-20-20=0

We add all the numbers together, and all the variables

-1f-(3f+20)-40=0

We get rid of parentheses

-1f-3f-20-40=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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