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2.5-4f=102.5f
We move all terms to the left:
2.5-4f-(102.5f)=0
We add all the numbers together, and all the variables
-4f-(+102.5f)+2.5=0
We get rid of parentheses
-4f-102.5f+2.5=0
We add all the numbers together, and all the variables
-106.5f+2.5=0
We move all terms containing f to the left, all other terms to the right
-106.5f=-2.5
f=-2.5/-106.5
f=1/42.6
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