View Compilation Error

0_0_33983320_20083.cpp: In function 'int main()':
0_0_33983320_20083.cpp:91:22: error: expected unqualified-id before '=' token
             __int128 = (solve(n+1,mod) - 2 ) % mod;
                      ^
0_0_33983320_20083.cpp:92:13: error: 'ans' was not declared in this scope
             ans = (ans + (3 + n+1) * (n-1) / 2)%mod;
             ^