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5e-9=7e-31
We move all terms to the left:
5e-9-(7e-31)=0
We get rid of parentheses
5e-7e+31-9=0
We add all the numbers together, and all the variables
-2e+22=0
We move all terms containing e to the left, all other terms to the right
-2e=-22
e=-22/-2
e=+11
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