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2e=4e-168
We move all terms to the left:
2e-(4e-168)=0
We get rid of parentheses
2e-4e+168=0
We add all the numbers together, and all the variables
-2e+168=0
We move all terms containing e to the left, all other terms to the right
-2e=-168
e=-168/-2
e=+84
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