Calculate the value of the equilibrium constant, c, for the reaction

Q(g)+X(g)=2M(g)+N(g)

given that

M(g)=Z(g) c1=3.97

6R(g)=2N(g)+4Z(g) c2=0.523

3X(g)+3Q(g)=9R(g) c3=11.8

Question is asking for c