9(f-100)=-81

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Solution for 9(f-100)=-81 equation: 



9(f-100)=-81

We move all terms to the left:

9(f-100)-(-81)=0

We add all the numbers together, and all the variables

9(f-100)+81=0

We multiply parentheses

9f-900+81=0

We add all the numbers together, and all the variables

9f-819=0

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

9f=819

f=819/9

f=91

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