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Question #47155

1 Answer

Nov 3, 2016

#n-1#

Explanation:

#{n-1-[n-1color(blue)(-(n-1))]}#

#={n-1-[n-1color(blue)(-n+1)]}#

#={n-1color(red)(-[n-1-n+1]}" "rarr {n-1-0}#

#={n-1color(red)(-n+1+n-1)}#

#={n-1}#

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