f+f+2f=20

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Solution for f+f+2f=20 equation: 



f+f+2f=20

We move all terms to the left:

f+f+2f-(20)=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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