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-8-10f+9=10-9f
We move all terms to the left:
-8-10f+9-(10-9f)=0
We add all the numbers together, and all the variables
-10f-(-9f+10)-8+9=0
We add all the numbers together, and all the variables
-10f-(-9f+10)+1=0
We get rid of parentheses
-10f+9f-10+1=0
We add all the numbers together, and all the variables
-1f-9=0
We move all terms containing f to the left, all other terms to the right
-f=9
f=9/-1
f=-9
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