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(9e)+90+(5e+6)=180
We move all terms to the left:
(9e)+90+(5e+6)-(180)=0
We add all the numbers together, and all the variables
9e+(5e+6)-90=0
We get rid of parentheses
9e+5e+6-90=0
We add all the numbers together, and all the variables
14e-84=0
We move all terms containing e to the left, all other terms to the right
14e=84
e=84/14
e=6
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