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2e-23=21-2e
We move all terms to the left:
2e-23-(21-2e)=0
We add all the numbers together, and all the variables
2e-(-2e+21)-23=0
We get rid of parentheses
2e+2e-21-23=0
We add all the numbers together, and all the variables
4e-44=0
We move all terms containing e to the left, all other terms to the right
4e=44
e=44/4
e=11
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