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-30=10e-10
We move all terms to the left:
-30-(10e-10)=0
We get rid of parentheses
-10e+10-30=0
We add all the numbers together, and all the variables
-10e-20=0
We move all terms containing e to the left, all other terms to the right
-10e=20
e=20/-10
e=-2
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