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2+2f=4f-10
We move all terms to the left:
2+2f-(4f-10)=0
We get rid of parentheses
2f-4f+10+2=0
We add all the numbers together, and all the variables
-2f+12=0
We move all terms containing f to the left, all other terms to the right
-2f=-12
f=-12/-2
f=+6
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