View Compilation Error

0_0_17844051_6142.cpp: In function 'void extend_Euclid(long long int, long long int, long long int&, long long int&)':
0_0_17844051_6142.cpp:22:11: error: expected primary-expression before ')' token
     if(!b)) {x = 1;y = 0;return;}
           ^