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13-4e=-2e-9
We move all terms to the left:
13-4e-(-2e-9)=0
We get rid of parentheses
-4e+2e+9+13=0
We add all the numbers together, and all the variables
-2e+22=0
We move all terms containing e to the left, all other terms to the right
-2e=-22
e=-22/-2
e=+11
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