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0=-f+9
We move all terms to the left:
0-(-f+9)=0
We add all the numbers together, and all the variables
-(-1f+9)+0=0
We add all the numbers together, and all the variables
-(-1f+9)=0
We get rid of parentheses
1f-9=0
We add all the numbers together, and all the variables
f-9=0
We move all terms containing f to the left, all other terms to the right
f=9
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