9(-10f-9)=-9f

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Solution for 9(-10f-9)=-9f equation: 



9(-10f-9)=-9f

We move all terms to the left:

9(-10f-9)-(-9f)=0

We multiply parentheses

-90f-(-9f)-81=0

We get rid of parentheses

-90f+9f-81=0

We add all the numbers together, and all the variables

-81f-81=0

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

-81f=81

f=81/-81

f=-1

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