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8=12-f
We move all terms to the left:
8-(12-f)=0
We add all the numbers together, and all the variables
-(-1f+12)+8=0
We get rid of parentheses
1f-12+8=0
We add all the numbers together, and all the variables
f-4=0
We move all terms containing f to the left, all other terms to the right
f=4
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