The angles shown above is supplementary. So we have to plug those equations together to find x.
12x-2+4x+6=180
16x+4=180
-4 -4
16x=176
x=11
Now that we found x, we have to substitute x with 11 in the equations!
4(11)+6 = 50
12(11)-2 = 130
So, mAnd, m