102=2(f+9)

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Solution for 102=2(f+9) equation: 



102=2(f+9)

We move all terms to the left:

102-(2(f+9))=0



We calculate terms in parentheses: -(2(f+9)), so:

2(f+9)

We multiply parentheses

2f+18

Back to the equation:

-(2f+18)



We get rid of parentheses

-2f-18+102=0

We add all the numbers together, and all the variables

-2f+84=0

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

-2f=-84

f=-84/-2

f=+42

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