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2=7-f
We move all terms to the left:
2-(7-f)=0
We add all the numbers together, and all the variables
-(-1f+7)+2=0
We get rid of parentheses
1f-7+2=0
We add all the numbers together, and all the variables
f-5=0
We move all terms containing f to the left, all other terms to the right
f=5
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