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-3.5=4f+5.7
We move all terms to the left:
-3.5-(4f+5.7)=0
We get rid of parentheses
-4f-5.7-3.5=0
We add all the numbers together, and all the variables
-4f-9.2=0
We move all terms containing f to the left, all other terms to the right
-4f=9.2
f=9.2/-4
f=-2+1/3.3333333333333
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