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508.68=3.14(2e)
We move all terms to the left:
508.68-(3.14(2e))=0
We add all the numbers together, and all the variables
-(+3.142e)+508.68=0
We get rid of parentheses
-3.142e+508.68=0
We move all terms containing e to the left, all other terms to the right
-3.142e=-508.68
e=-508.68/-3.142
e=161+2.818/3.142
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