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-9=-e-10
We move all terms to the left:
-9-(-e-10)=0
We add all the numbers together, and all the variables
-(-1e-10)-9=0
We get rid of parentheses
1e+10-9=0
We add all the numbers together, and all the variables
e+1=0
We move all terms containing e to the left, all other terms to the right
e=-1
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