25+4e-21=-20

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Solution for 25+4e-21=-20 equation: 



25+4e-21=-20

We move all terms to the left:

25+4e-21-(-20)=0

We add all the numbers together, and all the variables

4e+24=0

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

4e=-24

e=-24/4

e=-6

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