3x (2x-2) = 12, simple equation to calculate, and check calculation Simple equation to calculate, and check! Urgent

3x (2x-2) = 12, simple equation to calculate, and check calculation Simple equation to calculate, and check! Urgent

6X²-6X-12=0
X²-X-2=0
(X-2)(X+1)=0
X=2 X=-1
3*2(2*2-2)=6*2=12
3*(-1)[2*(-1)-2]=-3(-4)=12