$$- x ^ { 4 } - 3 y + x ^ { 4 } + 2 y - 5 + 3 y$$
$2y-5$
$$-x^{4}-y+x^{4}-5+3y$$
$$-x^{4}+2y+x^{4}-5$$
$$2y-5$$
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$2$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-x^{4}-y+x^{4}-5+3y)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-x^{4}+2y+x^{4}-5)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(2y-5)$$
$$2y^{1-1}$$
$$2y^{0}$$
$$2\times 1$$
$$2$$
