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6e-21=3e+6
We move all terms to the left:
6e-21-(3e+6)=0
We get rid of parentheses
6e-3e-6-21=0
We add all the numbers together, and all the variables
3e-27=0
We move all terms containing e to the left, all other terms to the right
3e=27
e=27/3
e=9
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