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3-8f=-7f-6
We move all terms to the left:
3-8f-(-7f-6)=0
We get rid of parentheses
-8f+7f+6+3=0
We add all the numbers together, and all the variables
-1f+9=0
We move all terms containing f to the left, all other terms to the right
-f=-9
f=-9/-1
f=+9
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