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42=5e-3
We move all terms to the left:
42-(5e-3)=0
We get rid of parentheses
-5e+3+42=0
We add all the numbers together, and all the variables
-5e+45=0
We move all terms containing e to the left, all other terms to the right
-5e=-45
e=-45/-5
e=+9
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