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2e+39=10e-9
We move all terms to the left:
2e+39-(10e-9)=0
We get rid of parentheses
2e-10e+9+39=0
We add all the numbers together, and all the variables
-8e+48=0
We move all terms containing e to the left, all other terms to the right
-8e=-48
e=-48/-8
e=+6
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