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4e-19=-3e+-12
We move all terms to the left:
4e-19-(-3e+-12)=0
We add all the numbers together, and all the variables
4e-(-3e-12)-19=0
We get rid of parentheses
4e+3e+12-19=0
We add all the numbers together, and all the variables
7e-7=0
We move all terms containing e to the left, all other terms to the right
7e=7
e=7/7
e=1
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