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7-2f=f-2
We move all terms to the left:
7-2f-(f-2)=0
We get rid of parentheses
-2f-f+2+7=0
We add all the numbers together, and all the variables
-3f+9=0
We move all terms containing f to the left, all other terms to the right
-3f=-9
f=-9/-3
f=+3
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