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-1+2f=-8+6f-3f
We move all terms to the left:
-1+2f-(-8+6f-3f)=0
We add all the numbers together, and all the variables
2f-(3f-8)-1=0
We get rid of parentheses
2f-3f+8-1=0
We add all the numbers together, and all the variables
-1f+7=0
We move all terms containing f to the left, all other terms to the right
-f=-7
f=-7/-1
f=+7
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