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2-2f=-8-4f
We move all terms to the left:
2-2f-(-8-4f)=0
We add all the numbers together, and all the variables
-2f-(-4f-8)+2=0
We get rid of parentheses
-2f+4f+8+2=0
We add all the numbers together, and all the variables
2f+10=0
We move all terms containing f to the left, all other terms to the right
2f=-10
f=-10/2
f=-5
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