(7-E)(3)=21e

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Solution for (7-E)(3)=21e equation: 



(7-)(3)=21E

We move all terms to the left:

(7-)(3)-(21E)=0

We add all the numbers together, and all the variables

-21E+03=0

We add all the numbers together, and all the variables

-21E+3=0

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

-21E=-3

E=-3/-21

E=1/7

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