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2.2e+1.2e=7
We move all terms to the left:
2.2e+1.2e-(7)=0
We add all the numbers together, and all the variables
3.4e-7=0
We move all terms containing e to the left, all other terms to the right
3.4e=7
e=7/3.4
e=2+0.2/3.4
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