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4e+6=7e-9
We move all terms to the left:
4e+6-(7e-9)=0
We get rid of parentheses
4e-7e+9+6=0
We add all the numbers together, and all the variables
-3e+15=0
We move all terms containing e to the left, all other terms to the right
-3e=-15
e=-15/-3
e=+5
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