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-648=676-f
We move all terms to the left:
-648-(676-f)=0
We add all the numbers together, and all the variables
-(-1f+676)-648=0
We get rid of parentheses
1f-676-648=0
We add all the numbers together, and all the variables
f-1324=0
We move all terms containing f to the left, all other terms to the right
f=1324
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