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90e+31.8=120e-150
We move all terms to the left:
90e+31.8-(120e-150)=0
We get rid of parentheses
90e-120e+150+31.8=0
We add all the numbers together, and all the variables
-30e+181.8=0
We move all terms containing e to the left, all other terms to the right
-30e=-181.8
e=-181.8/-30
e=6+1/16.666666666667
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