$$8+2x=2(x+4)$$
$x\in \mathrm{C}$
$$8+2x=2x+8$$
$$8+2x-2x=8$$
$$8=8$$
$$\text{true}$$
$$x\in \mathrm{C}$$
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$x\in \mathrm{R}$
$$x\in \mathrm{R}$$