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1.8f+6=2.8f+3
We move all terms to the left:
1.8f+6-(2.8f+3)=0
We get rid of parentheses
1.8f-2.8f-3+6=0
We add all the numbers together, and all the variables
-1f+3=0
We move all terms containing f to the left, all other terms to the right
-f=-3
f=-3/-1
f=+3
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