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0.55f-1.1=1.21
We move all terms to the left:
0.55f-1.1-(1.21)=0
We add all the numbers together, and all the variables
0.55f-2.31=0
We move all terms containing f to the left, all other terms to the right
0.55f=2.31
f=2.31/0.55
f=4+0.11/0.55
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