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4e-19=-3-12
We move all terms to the left:
4e-19-(-3-12)=0
We add all the numbers together, and all the variables
4e-19-(-15)=0
We add all the numbers together, and all the variables
4e-4=0
We move all terms containing e to the left, all other terms to the right
4e=4
e=4/4
e=1
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