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210=3e-3
We move all terms to the left:
210-(3e-3)=0
We get rid of parentheses
-3e+3+210=0
We add all the numbers together, and all the variables
-3e+213=0
We move all terms containing e to the left, all other terms to the right
-3e=-213
e=-213/-3
e=+71
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