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