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