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