69=3f-(-9)

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Solution for 69=3f-(-9) equation: 



69=3f-(-9)

We move all terms to the left:

69-(3f-(-9))=0



We calculate terms in parentheses: -(3f-(-9)), so:

3f-(-9)

We add all the numbers together, and all the variables

3f+9

Back to the equation:

-(3f+9)



We get rid of parentheses

-3f-9+69=0

We add all the numbers together, and all the variables

-3f+60=0

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

-3f=-60

f=-60/-3

f=+20

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