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7+0.4e=8.2
We move all terms to the left:
7+0.4e-(8.2)=0
We add all the numbers together, and all the variables
0.4e-1.2=0
We move all terms containing e to the left, all other terms to the right
0.4e=1.2
e=1.2/0.4
e=2+0.4/0.4
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