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6e-25=-e-4
We move all terms to the left:
6e-25-(-e-4)=0
We add all the numbers together, and all the variables
6e-(-1e-4)-25=0
We get rid of parentheses
6e+1e+4-25=0
We add all the numbers together, and all the variables
7e-21=0
We move all terms containing e to the left, all other terms to the right
7e=21
e=21/7
e=3
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