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