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-f=-9-10f
We move all terms to the left:
-f-(-9-10f)=0
We add all the numbers together, and all the variables
-f-(-10f-9)=0
We add all the numbers together, and all the variables
-1f-(-10f-9)=0
We get rid of parentheses
-1f+10f+9=0
We add all the numbers together, and all the variables
9f+9=0
We move all terms containing f to the left, all other terms to the right
9f=-9
f=-9/9
f=-1
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