View Compilation Error

0_0_17302642_18818.cpp: In function 'void dfs2(int, int)':
0_0_17302642_18818.cpp:71:45: error: 'x' was not declared in this scope
     dp3[k][mask] = (dp3[k][mask] * quickPow(x, MOD - 2)) % MOD;
                                             ^