$$3 a ( a + b + c ) - 2 b ( a - b + c ) 4 c ( - a + b + c )$$
$-8bc\left(-\left(a-b\right)^{2}+c^{2}\right)+3a\left(a+b+c\right)$
$3a^{2}+3ab-16acb^{2}+3ac-8bc^{3}+8bca^{2}+8cb^{3}$
