( 34 567 + 23 456 ) + ( 34 567 - 23 456 ) =
58 023 + ( 34 567 - 23 456 ) =
58 023 + 11 111 =
69 134
( 98 765 - 87 654 ) + ( 23 456 + 12 121 ) =
11 111 + ( 23 456 + 12 121 ) =
11 111 + 35 577 =
46 688
