$$9\frac{1}{4}=y-1\frac{1}{3}$$
$y = \frac{127}{12} = 10\frac{7}{12} \approx 10.583333333$
$$3\left(9\times 4+1\right)=12y-4\left(3+1\right)$$
$$3\left(36+1\right)=12y-4\left(3+1\right)$$
$$3\times 37=12y-4\left(3+1\right)$$
$$111=12y-4\left(3+1\right)$$
$$111=12y-4\times 4$$
$$111=12y-16$$
$$12y-16=111$$
$$12y=111+16$$
$$12y=127$$
$$y=\frac{127}{12}$$
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