what is one and six twelfth minus one and nine twelfth?

\(\large 1\frac{6}{12}-1\frac{9}{12}=1-1+\frac{6}{12}-\frac{9}{12}=-\frac{3}{12}=-\frac{1}{4}\)

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Good job I guess?? Was this to show someone how to do it or... I don't know...