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4e+30=4.50e
We move all terms to the left:
4e+30-(4.50e)=0
We add all the numbers together, and all the variables
4e-(+4.50e)+30=0
We get rid of parentheses
4e-4.50e+30=0
We add all the numbers together, and all the variables
-0.5e+30=0
We move all terms containing e to the left, all other terms to the right
-0.5e=-30
e=-30/-0.5
e=+60
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