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-10=2.5f
We move all terms to the left:
-10-(2.5f)=0
We add all the numbers together, and all the variables
-(+2.5f)-10=0
We get rid of parentheses
-2.5f-10=0
We move all terms containing f to the left, all other terms to the right
-2.5f=10
f=10/-2.5
f=-4
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