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4=5e+9
We move all terms to the left:
4-(5e+9)=0
We get rid of parentheses
-5e-9+4=0
We add all the numbers together, and all the variables
-5e-5=0
We move all terms containing e to the left, all other terms to the right
-5e=5
e=5/-5
e=-1
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