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2e+5=5e-4
We move all terms to the left:
2e+5-(5e-4)=0
We get rid of parentheses
2e-5e+4+5=0
We add all the numbers together, and all the variables
-3e+9=0
We move all terms containing e to the left, all other terms to the right
-3e=-9
e=-9/-3
e=+3
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