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13=40-3f
We move all terms to the left:
13-(40-3f)=0
We add all the numbers together, and all the variables
-(-3f+40)+13=0
We get rid of parentheses
3f-40+13=0
We add all the numbers together, and all the variables
3f-27=0
We move all terms containing f to the left, all other terms to the right
3f=27
f=27/3
f=9
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