(WY - VX) / 2 = U ---> (WY - VX) / 2 = 30 ---> WY - VX = 60
360 - [ arc(XY) + arc(VW) ] = WY + VX ---> 360 - [ 120 + 130 ] = WY + VX
---> 110 = WY + VX
Putting the two equations together: WY + VX = 110
WY - VX = 60
2WY = 170 ---> WY = 85 ---> VX = 25
