$$12 y - 7 y - 3 y$$
$2y$
$$5y-3y$$
$$2y$$
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$2$
$$\frac{\mathrm{d}}{\mathrm{d}y}(5y-3y)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(2y)$$
$$2y^{1-1}$$
$$2y^{0}$$
$$2\times 1$$
$$2$$
