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1/a+1/2a=1/a-3 What are the excluded values of this expression??

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Explain how to determine what type of triangle is created if you are given three sides. How can you tell if it is an acute triangle? How can you tell if it is an right triangle? How can you tell if it is an abtuse triangle?
1/a+1/2a=1/a-3 What are the excluded values of this expression??-example-1
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