1}957-{t+336}=428 2}325-{a-617}=219

957 - (t + 336) = 428;

t + 336 = 957 - 428;

t + 336 = 529;

t = 529 - 336;

t = 193;

957 - (193 + 336) = 428;

957 - 529 = 428;

428 = 428;

325 - (a - 617) = 219;

а - 617 = 325 - 219;

а - 617 = 106;

а = 106 + 617;

а = 723;

325 - (723 - 617) = 219;

325 - 106 = 219;

219 = 219.