Ini kayak apa? Tolonggg

(n+2)(n+1)(n)(n-1)!/(n-1)!=6n
(n²+3n+2)(n)=6n
(n³+3n²+2n)=6n
n³+3n²+2n-6n)=0
n³+3n²-4n=0
n(n²+3n-4)=0
n(n+4)(n-1)=0
n=0
n=1
n=-4