$$5 \times +3(2 \times -y)=35$$
$y = -\frac{7}{6} = -1\frac{1}{6} \approx -1.166666667$
$$15\times 2\left(-y\right)=35$$
$$30\left(-y\right)=35$$
$$-y=\frac{35}{30}$$
$$-y=\frac{7}{6}$$
$$y=-\frac{7}{6}$$
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