12=-2(f+3)

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Solution for 12=-2(f+3) equation: 



12=-2(f+3)

We move all terms to the left:

12-(-2(f+3))=0



We calculate terms in parentheses: -(-2(f+3)), so:

-2(f+3)

We multiply parentheses

-2f-6

Back to the equation:

-(-2f-6)



We get rid of parentheses

2f+6+12=0

We add all the numbers together, and all the variables

2f+18=0

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

2f=-18

f=-18/2

f=-9

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