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You don't.
You are on the wrong path to the answer.
.......2NO(g) + O2(g)---> 2NO2(g)
I.......10.0....10.0........0
C.......-2p.....-p.........+2p
E.....10-2p.....10-p........2p
Substitute the E line into the Kp expression and solve for p and 2p.