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9e=7e+10
We move all terms to the left:
9e-(7e+10)=0
We get rid of parentheses
9e-7e-10=0
We add all the numbers together, and all the variables
2e-10=0
We move all terms containing e to the left, all other terms to the right
2e=10
e=10/2
e=5
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