-4f+9=8f+9

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



-4f+9=8f+9

We move all terms to the left:

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

We get rid of parentheses

-4f-8f-9+9=0

We add all the numbers together, and all the variables

-12f=0

f=0/-12

f=0

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