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