Answer
-$\frac{2}{3}$
Work Step by Step
$\frac{9}{12}$ - $\frac{7}{12}$-$\frac{10}{12}$
= $\frac{9-7-10}{12}$
=$\frac{-8}{12}$
=-$\frac{4\times 2}{4\times3}$
= -$\frac{2}{3}$
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