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12=3e-186e
We move all terms to the left:
12-(3e-186e)=0
We add all the numbers together, and all the variables
-(-183e)+12=0
We get rid of parentheses
183e+12=0
We move all terms containing e to the left, all other terms to the right
183e=-12
e=-12/183
e=-4/61
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