4e+21=9

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Solution for 4e+21=9 equation: 



4e+21=9

We move all terms to the left:

4e+21-(9)=0

We add all the numbers together, and all the variables

4e+12=0

We move all terms containing e to the left, all other terms to the right

4e=-12

e=-12/4

e=-3

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