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-2.66-9.89-3.9f=-8.65-2.4f
We move all terms to the left:
-2.66-9.89-3.9f-(-8.65-2.4f)=0
We add all the numbers together, and all the variables
-3.9f-(-2.4f-8.65)-2.66-9.89=0
We add all the numbers together, and all the variables
-3.9f-(-2.4f-8.65)-12.55=0
We get rid of parentheses
-3.9f+2.4f+8.65-12.55=0
We add all the numbers together, and all the variables
-1.5f-3.9=0
We move all terms containing f to the left, all other terms to the right
-1.5f=3.9
f=3.9/-1.5
f=-2+0.9/1.5
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