= $140+7/30$ - $138+5/12$

= 140 + 7/30 - 138 - 5/12

= 140 - 138 + 7/30 - 5/12

= 2 + $28/120$ - $60/120$

= 2 - 32/120

= 2 - 8/30

= 2 - 4/15

= 30/15 - 4/15

= 26/15

Therefore, $1407/30-1385/12$ = 18 1/16 is incorrect. The correct answer is 26/15.