$$y^{7}\div y^{5}+y^{2}=$$
$2y^{2}$
$$y^{2}+y^{2}$$
$$2y^{2}$$
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$4y$
$$\frac{\mathrm{d}}{\mathrm{d}y}(y^{2}+y^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(2y^{2})$$
$$2\times 2y^{2-1}$$
$$4y^{2-1}$$
$$4y^{1}$$
$$4y$$
