871 - ( 594 - 546 ) - 138 = 730
1) 549 - 546 = 3
2) 871 - 3 = 868
3) 868 - 138 = 730
376 + ( 434 - 254 ) + 329 = 885
1) 434 - 254 = 180
2) 376 + 180 = 556
3) 556 + 329 = 885
871 - ( 594 - 546 ) - 138 = 730
1) 549 - 546 = 3
2) 871 - 3 = 868
3) 868 - 138 = 730
376 + ( 434 - 254 ) + 329 = 885
1) 434 - 254 = 180
2) 376 + 180 = 556
3) 556 + 329 = 885