-2+9f-7f=8f-20

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Solution for -2+9f-7f=8f-20 equation: 



-2+9f-7f=8f-20

We move all terms to the left:

-2+9f-7f-(8f-20)=0

We add all the numbers together, and all the variables

2f-(8f-20)-2=0

We get rid of parentheses

2f-8f+20-2=0

We add all the numbers together, and all the variables

-6f+18=0

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

-6f=-18

f=-18/-6

f=+3

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