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