$${ \left(a+b+c \right) }^{ 2 } - { \left(a+b+c \right) }^{ 2 }$$
$0$
$$a^{2}+2ab+2ac+b^{2}+2bc+c^{2}-\left(a+b+c\right)^{2}$$
$$a^{2}+2ab+2ac+b^{2}+2bc+c^{2}-\left(a^{2}+2ab+2ac+b^{2}+2bc+c^{2}\right)$$
$$0$$
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