3f=-9(-f-4)

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Solution for 3f=-9(-f-4) equation: 



3f=-9(-f-4)

We move all terms to the left:

3f-(-9(-f-4))=0

We add all the numbers together, and all the variables

3f-(-9(-1f-4))=0



We calculate terms in parentheses: -(-9(-1f-4)), so:

-9(-1f-4)

We multiply parentheses

9f+36

Back to the equation:

-(9f+36)



We get rid of parentheses

3f-9f-36=0

We add all the numbers together, and all the variables

-6f-36=0

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

-6f=36

f=36/-6

f=-6

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