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-2-9f=-8-10f
We move all terms to the left:
-2-9f-(-8-10f)=0
We add all the numbers together, and all the variables
-9f-(-10f-8)-2=0
We get rid of parentheses
-9f+10f+8-2=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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