Помогите решить 2 уравнения
1:17n+14n-145=134
2:5n+9n+32=200
Умоляююю срочно.

1)17n+14n-145=134          2)5n+9n+32=200   31n-145=134                    14n+32=200   31n=134+145                    14n=200-32   31n=279                           14n=168   n=279:31                          n=168:14   n=9                                  n=12