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7=12-5e
We move all terms to the left:
7-(12-5e)=0
We add all the numbers together, and all the variables
-(-5e+12)+7=0
We get rid of parentheses
5e-12+7=0
We add all the numbers together, and all the variables
5e-5=0
We move all terms containing e to the left, all other terms to the right
5e=5
e=5/5
e=1
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