3=-(f+-9)

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



3=-(f+-9)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-(f-9)

We get rid of parentheses

-f+9

We add all the numbers together, and all the variables

-1f+9

Back to the equation:

-(-1f+9)



We get rid of parentheses

1f-9+3=0

We add all the numbers together, and all the variables

f-6=0

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

f=6

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