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25=4e+5
We move all terms to the left:
25-(4e+5)=0
We get rid of parentheses
-4e-5+25=0
We add all the numbers together, and all the variables
-4e+20=0
We move all terms containing e to the left, all other terms to the right
-4e=-20
e=-20/-4
e=+5
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