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9e+4=-9e
We move all terms to the left:
9e+4-(-9e)=0
We get rid of parentheses
9e+9e+4=0
We add all the numbers together, and all the variables
18e+4=0
We move all terms containing e to the left, all other terms to the right
18e=-4
e=-4/18
e=-2/9
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