9+12e=-99

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Solution for 9+12e=-99 equation: 



9+12e=-99

We move all terms to the left:

9+12e-(-99)=0

We add all the numbers together, and all the variables

12e+108=0

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

12e=-108

e=-108/12

e=-9

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