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