Find the missing digit:

0-875?7-79000-7

0x3+8+7x3+5+Nx3+7+7x3+9+0x3+0+0x3+7=0

8+21+5+Nx3+7+21+9+7=0

78+Nx3=0

8+Nx3=0

Nx3=0-8=2

We need Nx3=2, 12 or 22

4x3=12

N=4