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30=2e-10
We move all terms to the left:
30-(2e-10)=0
We get rid of parentheses
-2e+10+30=0
We add all the numbers together, and all the variables
-2e+40=0
We move all terms containing e to the left, all other terms to the right
-2e=-40
e=-40/-2
e=+20
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