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517+a=800....b+124=430...c-253=129...701-d=543..

Răspuns :

517 + a = 800
a = 800 - 517
a = 283.

b +124 = 430
a = 430 - 124
b = 306

c - 253 = 129
c = 129 + 253
c = 382

701 - d = 543
d = 701 - 543
d = 158.
800-517=283,a=283;430-124=306,b=306;253-129=124,c=124;701-543=158,d=158,ex:158+543=701.