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6e+3=8e-21
We move all terms to the left:
6e+3-(8e-21)=0
We get rid of parentheses
6e-8e+21+3=0
We add all the numbers together, and all the variables
-2e+24=0
We move all terms containing e to the left, all other terms to the right
-2e=-24
e=-24/-2
e=+12
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