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-8-4f=-2f+10
We move all terms to the left:
-8-4f-(-2f+10)=0
We get rid of parentheses
-4f+2f-10-8=0
We add all the numbers together, and all the variables
-2f-18=0
We move all terms containing f to the left, all other terms to the right
-2f=18
f=18/-2
f=-9
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