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2e-9=3e+1
We move all terms to the left:
2e-9-(3e+1)=0
We get rid of parentheses
2e-3e-1-9=0
We add all the numbers together, and all the variables
-1e-10=0
We move all terms containing e to the left, all other terms to the right
-e=10
e=10/-1
e=-10
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