31=4+2(f+9)

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Solution for 31=4+2(f+9) equation: 



31=4+2(f+9)

We move all terms to the left:

31-(4+2(f+9))=0



We calculate terms in parentheses: -(4+2(f+9)), so:

4+2(f+9)

determiningTheFunctionDomain
2(f+9)+4

We multiply parentheses

2f+18+4

We add all the numbers together, and all the variables

2f+22

Back to the equation:

-(2f+22)



We get rid of parentheses

-2f-22+31=0

We add all the numbers together, and all the variables

-2f+9=0

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

-2f=-9

f=-9/-2

f=4+1/2

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