14045−x=14012+14021\hfillx=14045−(14012+14021)\hfillx=14045−14012−14021\hfillx=14045−12−21\hfillx=14012=353\hfill
14045−x=14012+14021\hfillx=14045−(14012+14021)\hfillx=14045−14012−14021\hfillx=14045−12−21\hfillx=14012=353\hfill