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11=2e+9
We move all terms to the left:
11-(2e+9)=0
We get rid of parentheses
-2e-9+11=0
We add all the numbers together, and all the variables
-2e+2=0
We move all terms containing e to the left, all other terms to the right
-2e=-2
e=-2/-2
e=1
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