567 + X = 1000X = 1000 - 567X = 433
345/X = 234X = 345/234X = 1.474
3456 - X = 456X = 3456 - 456X = 3000
567 + X = 1000
X = 1000 - 567
X = 433
345/X = 234
X = 345/234
X = 1.474
3456 - X = 456
X = 3456 - 456
X = 3000