$$5+3x+10+14+20$$
$3x+49$
$$15+3x+14+20$$
$$29+3x+20$$
$$49+3x$$
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$3$
$$\frac{\mathrm{d}}{\mathrm{d}x}(15+3x+14+20)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(29+3x+20)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(49+3x)$$
$$3x^{1-1}$$
$$3x^{0}$$
$$3\times 1$$
$$3$$