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13=29-2f
We move all terms to the left:
13-(29-2f)=0
We add all the numbers together, and all the variables
-(-2f+29)+13=0
We get rid of parentheses
2f-29+13=0
We add all the numbers together, and all the variables
2f-16=0
We move all terms containing f to the left, all other terms to the right
2f=16
f=16/2
f=8
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