You cant. You need the RegionX/Y component to calculate the clients X/Y coordinates. /frame command will tell you these.
Equation for Client to Actual Coordinates. You can rearrange it for Actual to Client
Code:
xpos = (client_x % 192) * 10
ypos = (client_y % 192) * 10
region_x = (client_x - xpos / 10) / 192 + 135
region_y = (client_y - ypos / 10) / 192 + 92