Х-319=200 х+403=604 178-Z=85 365+Y=900
1 X=319+200 X=519 2 X=604-403 X=201 3 Z=178-85 Z=93 4 Y=900-365 Y=535
1) х - 319 = 200, х = 200 + 319, х = 519; 2) x + 403 = 604, x = 604 - 403, x = 201; 3) 178 - z = 85, z = 178 - 85, z = 93; 4) 365 + y = 900, y = 900 - 365, y = 535.