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4f+5.7=-3.5
We move all terms to the left:
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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