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