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5e-9=-(10e-1)
We move all terms to the left:
5e-9-(-(10e-1))=0
We calculate terms in parentheses: -(-(10e-1)), so:We get rid of parentheses
-(10e-1)
We get rid of parentheses
-10e+1
Back to the equation:
-(-10e+1)
5e+10e-1-9=0
We add all the numbers together, and all the variables
15e-10=0
We move all terms containing e to the left, all other terms to the right
15e=10
e=10/15
e=2/3
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