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The expression (m-n)-(n-m) is equivalent to
a) 2m-2n
b) 2m
c) -2n
d) m-n

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Suggested Answer

[tex](m-n)-(n-m)=m-n -(n-m)= m-n-n+m=(m+m)-n-n=2m-2n[/tex]

Suggested Answer

[tex](m-n)-(n-m)=m-n-n+m=2m-2n[/tex]The answer: a)

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