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18=6e+4e-12
We move all terms to the left:
18-(6e+4e-12)=0
We add all the numbers together, and all the variables
-(10e-12)+18=0
We get rid of parentheses
-10e+12+18=0
We add all the numbers together, and all the variables
-10e+30=0
We move all terms containing e to the left, all other terms to the right
-10e=-30
e=-30/-10
e=+3
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