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-8f+9=-10f-9-2
We move all terms to the left:
-8f+9-(-10f-9-2)=0
We add all the numbers together, and all the variables
-8f-(-10f-11)+9=0
We get rid of parentheses
-8f+10f+11+9=0
We add all the numbers together, and all the variables
2f+20=0
We move all terms containing f to the left, all other terms to the right
2f=-20
f=-20/2
f=-10
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