8+9=2f+9f-4

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Solution for 8+9=2f+9f-4 equation: 



8+9=2f+9f-4

We move all terms to the left:

8+9-(2f+9f-4)=0

We add all the numbers together, and all the variables

-(11f-4)+8+9=0

We add all the numbers together, and all the variables

-(11f-4)+17=0

We get rid of parentheses

-11f+4+17=0

We add all the numbers together, and all the variables

-11f+21=0

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

-11f=-21

f=-21/-11

f=1+10/11

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