30+7.5e=-12

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Solution for 30+7.5e=-12 equation: 



30+7.5e=-12

We move all terms to the left:

30+7.5e-(-12)=0

We add all the numbers together, and all the variables

7.5e+42=0

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

7.5e=-42

e=-42/7.5

e=-5+3/5

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