61=9f-20

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Solution for 61=9f-20 equation: 



61=9f-20

We move all terms to the left:

61-(9f-20)=0

We get rid of parentheses

-9f+20+61=0

We add all the numbers together, and all the variables

-9f+81=0

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

-9f=-81

f=-81/-9

f=+9

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