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4e+15=7e+3
We move all terms to the left:
4e+15-(7e+3)=0
We get rid of parentheses
4e-7e-3+15=0
We add all the numbers together, and all the variables
-3e+12=0
We move all terms containing e to the left, all other terms to the right
-3e=-12
e=-12/-3
e=+4
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