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-9-8f=-10f-f+9
We move all terms to the left:
-9-8f-(-10f-f+9)=0
We add all the numbers together, and all the variables
-8f-(-11f+9)-9=0
We get rid of parentheses
-8f+11f-9-9=0
We add all the numbers together, and all the variables
3f-18=0
We move all terms containing f to the left, all other terms to the right
3f=18
f=18/3
f=6
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