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-33=6f-4f
We move all terms to the left:
-33-(6f-4f)=0
We add all the numbers together, and all the variables
-(+2f)-33=0
We get rid of parentheses
-2f-33=0
We move all terms containing f to the left, all other terms to the right
-2f=33
f=33/-2
f=-16+1/2
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