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-4e-7=9e+12
We move all terms to the left:
-4e-7-(9e+12)=0
We get rid of parentheses
-4e-9e-12-7=0
We add all the numbers together, and all the variables
-13e-19=0
We move all terms containing e to the left, all other terms to the right
-13e=19
e=19/-13
e=-1+6/13
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