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-15.5f=18.5f-11.7
We move all terms to the left:
-15.5f-(18.5f-11.7)=0
We get rid of parentheses
-15.5f-18.5f+11.7=0
We add all the numbers together, and all the variables
-34f+11.7=0
We move all terms containing f to the left, all other terms to the right
-34f=-11.7
f=-11.7/-34
f=6.8823529411765/20
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