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9.1f=6.6f-12.25
We move all terms to the left:
9.1f-(6.6f-12.25)=0
We get rid of parentheses
9.1f-6.6f+12.25=0
We add all the numbers together, and all the variables
2.5f+12.25=0
We move all terms containing f to the left, all other terms to the right
2.5f=-12.25
f=-12.25/2.5
f=-4+1/1.1111111111111
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