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2=5(e)-21
We move all terms to the left:
2-(5(e)-21)=0
We get rid of parentheses
-5e+21+2=0
We add all the numbers together, and all the variables
-5e+23=0
We move all terms containing e to the left, all other terms to the right
-5e=-23
e=-23/-5
e=4+3/5
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