Determine overall Keq, given K1 and K2

Given the following information:
H2S (aq) <-> H+ (aq) + HS- (aq) K= 8.9 x 10^-8
H+ (aq) + S2- (aq) <-> HS- (aq) K= 8.3 x 10^12
determine the equilibrium constant for the reaction:
H2S (aq) <-> 2 H+ (aq) + S2- (aq)

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...m constant for the reaction:
H2S (aq) <-> 2 H+ (aq) + S2- (aq)
Solution:
H2S (aq) <-> H+ (aq) + HS- (aq) K= 8.9 x 10-8
[H^+ ][〖HS〗^- ]/[H_2 S] ...