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3=5e-12
We move all terms to the left:
3-(5e-12)=0
We get rid of parentheses
-5e+12+3=0
We add all the numbers together, and all the variables
-5e+15=0
We move all terms containing e to the left, all other terms to the right
-5e=-15
e=-15/-5
e=+3
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