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7+3e-12e=3e+1
We move all terms to the left:
7+3e-12e-(3e+1)=0
We add all the numbers together, and all the variables
-9e-(3e+1)+7=0
We get rid of parentheses
-9e-3e-1+7=0
We add all the numbers together, and all the variables
-12e+6=0
We move all terms containing e to the left, all other terms to the right
-12e=-6
e=-6/-12
e=1/2
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