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4e-1=5e+2
We move all terms to the left:
4e-1-(5e+2)=0
We get rid of parentheses
4e-5e-2-1=0
We add all the numbers together, and all the variables
-1e-3=0
We move all terms containing e to the left, all other terms to the right
-e=3
e=3/-1
e=-3
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