Those are 2 different equations. I think I know where you got confused.
costs 15 - (3 IPCs)*(2 VCPs) = 9 IPCs. (The * symbol means multiplication)
This is an example for the correct equation 15 - (IPC value) * (VCP value) = (Cost of IC) applied to India.
India is worth 3 IPCs and 2 VCPs so if you plug it into the equation you get:
15 - (3 IPCs) * (2 VCPs) = 15 - 3*2 = 15 - 6 = 9
The “3 IPCs” doesn’t mean “3 * IPCs” it means that what there are 3 of are IPCs. (like saying I have 3 apples doesn’t mean I have 3 * apples).
Does this make sense?