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2.5f=-5+3.5f
We move all terms to the left:
2.5f-(-5+3.5f)=0
We add all the numbers together, and all the variables
2.5f-(3.5f-5)=0
We get rid of parentheses
2.5f-3.5f+5=0
We add all the numbers together, and all the variables
-1f+5=0
We move all terms containing f to the left, all other terms to the right
-f=-5
f=-5/-1
f=+5
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