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-2+6f=8+7f
We move all terms to the left:
-2+6f-(8+7f)=0
We add all the numbers together, and all the variables
6f-(7f+8)-2=0
We get rid of parentheses
6f-7f-8-2=0
We add all the numbers together, and all the variables
-1f-10=0
We move all terms containing f to the left, all other terms to the right
-f=10
f=10/-1
f=-10
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