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Sheila Notes That If a=20\mathrm{a}=20 And b=20\mathrm{b}=20 , Then a−b=b−a=0\mathrm{a}-\mathrm{b}=\mathrm{b}-\mathrm{a}=0 She Concludes That for Any Real Numbers

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Sheila notes that if a=20\mathrm{a}=20 and b=20\mathrm{b}=20 , then a−b=b−a=0\mathrm{a}-\mathrm{b}=\mathrm{b}-\mathrm{a}=0 . She concludes that for any real numbers a\mathrm{a} and b,a−b=b−a\mathrm{b}, \mathrm{a}-\mathrm{b}=\mathrm{b}-\mathrm{a} . Do you agree with her reasoning? If not, why not?

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