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5e+7=2e+907
We move all terms to the left:
5e+7-(2e+907)=0
We get rid of parentheses
5e-2e-907+7=0
We add all the numbers together, and all the variables
3e-900=0
We move all terms containing e to the left, all other terms to the right
3e=900
e=900/3
e=300
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