if you do real math it is 19, if you wached video on YouTube then it is 21
(99+43)/2
142/2
it is 71
if you do math it is 19, if you watched video from YouTube then it is 21
it is 36/4 = 9
5.1-2.3z=12
5.1-12=2.3z
-6.9=2.3z
z=-3
