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2.1=f-7.6
We move all terms to the left:
2.1-(f-7.6)=0
We get rid of parentheses
-f+7.6+2.1=0
We add all the numbers together, and all the variables
-1f+9.7=0
We move all terms containing f to the left, all other terms to the right
-f=-9.7
f=-9.7/-1
f=9+0.7/1
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