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5=2.8+f
We move all terms to the left:
5-(2.8+f)=0
We add all the numbers together, and all the variables
-(f+2.8)+5=0
We get rid of parentheses
-f-2.8+5=0
We add all the numbers together, and all the variables
-1f+2.2=0
We move all terms containing f to the left, all other terms to the right
-f=-2.2
f=-2.2/-1
f=2+0.2/1
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