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3e+18=5e+4
We move all terms to the left:
3e+18-(5e+4)=0
We get rid of parentheses
3e-5e-4+18=0
We add all the numbers together, and all the variables
-2e+14=0
We move all terms containing e to the left, all other terms to the right
-2e=-14
e=-14/-2
e=+7
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