$$7a\bullet5+(\cdot+5)\cdot2a$$
$5a$
$$35a-15\times 2a$$
$$35a-30a$$
$$5a$$
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$5$
$$\frac{\mathrm{d}}{\mathrm{d}a}(35a-15\times 2a)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(35a-30a)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(5a)$$
$$5a^{1-1}$$
$$5a^{0}$$
$$5\times 1$$
$$5$$
