3f+11=20

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Solution for 3f+11=20 equation: 



3f+11=20

We move all terms to the left:

3f+11-(20)=0

We add all the numbers together, and all the variables

3f-9=0

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

3f=9

f=9/3

f=3

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