f+20=3f-20

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



f+20=3f-20

We move all terms to the left:

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

We get rid of parentheses

f-3f+20+20=0

We add all the numbers together, and all the variables

-2f+40=0

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

-2f=-40

f=-40/-2

f=+20

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