$$(2,1)y(1,5)$$
$3,15$
$$\frac{\mathrm{d}}{\mathrm{d}y}(3,15y)$$
$$3,15y^{1-1}$$
$$3,15y^{0}$$
$$3,15\times 1$$
$$3,15$$
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$\frac{63y}{20}$
$$3,15y$$