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3(+2)+9=13+5f
We move all terms to the left:
3(+2)+9-(13+5f)=0
We add all the numbers together, and all the variables
-(5f+13)+9+32=0
We add all the numbers together, and all the variables
-(5f+13)+41=0
We get rid of parentheses
-5f-13+41=0
We add all the numbers together, and all the variables
-5f+28=0
We move all terms containing f to the left, all other terms to the right
-5f=-28
f=-28/-5
f=5+3/5
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