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7=1+3f
We move all terms to the left:
7-(1+3f)=0
We add all the numbers together, and all the variables
-(3f+1)+7=0
We get rid of parentheses
-3f-1+7=0
We add all the numbers together, and all the variables
-3f+6=0
We move all terms containing f to the left, all other terms to the right
-3f=-6
f=-6/-3
f=+2
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