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4.2e+4=-5e+13+10e
We move all terms to the left:
4.2e+4-(-5e+13+10e)=0
We add all the numbers together, and all the variables
4.2e-(5e+13)+4=0
We get rid of parentheses
4.2e-5e-13+4=0
We add all the numbers together, and all the variables
-0.8e-9=0
We move all terms containing e to the left, all other terms to the right
-0.8e=9
e=9/-0.8
e=-11+0.2/0.8
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