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2f+6=-f-4+4f
We move all terms to the left:
2f+6-(-f-4+4f)=0
We add all the numbers together, and all the variables
2f-(3f-4)+6=0
We get rid of parentheses
2f-3f+4+6=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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