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11=-2.1+f
We move all terms to the left:
11-(-2.1+f)=0
We add all the numbers together, and all the variables
-(f-2.1)+11=0
We get rid of parentheses
-f+2.1+11=0
We add all the numbers together, and all the variables
-1f+13.1=0
We move all terms containing f to the left, all other terms to the right
-f=-13.1
f=-13.1/-1
f=13+0.1/1
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