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how is y-2y8y-6 equivilant to 1

Im trying to brush up on my algebra for either the ASVAB or the NCLEX (havent decided which yet) and this eqation is on the ASVAB practice test, it is worded "which of the following is equivilant to y-2y8y-6  a) 0 b)1 c)-1 d)y^3"  on the asnwer section it says 1 is the correct answer but I have no idea how they are getting there. 

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Jason S. | My goal is the success of my students. Knowledge-Patience-HonestyMy goal is the success of my students. K...
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Either that is not the entire question or the problem y-2y8y-6 is not typed properly.


Could you please provide the entire question or retype it exactly as it is on the page in the book?