$$x+2x+3x=$$
$6x$
$$3x+3x$$
$$6x$$
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$6$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x+3x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(6x)$$
$$6x^{1-1}$$
$$6x^{0}$$
$$6\times 1$$
$$6$$