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-9f=-8-5f
We move all terms to the left:
-9f-(-8-5f)=0
We add all the numbers together, and all the variables
-9f-(-5f-8)=0
We get rid of parentheses
-9f+5f+8=0
We add all the numbers together, and all the variables
-4f+8=0
We move all terms containing f to the left, all other terms to the right
-4f=-8
f=-8/-4
f=+2
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