a) 247 + x = 783
x = 783 - 247
x = 536
b) x + 318 = 2467
x = 2467 - 318
x = 2149
c) 735 - x = 517
x = 735 - 517
x = 218
d) x - 482 = 267
x = 482 + 267
x = 749
e) 23.536 - x = 10.039
x = 23.536 - 10.039
x = 13.497
f) 4357 + x + 937 = 6251
x = 6251 - 4357 - 937
x = 957
g) 873 - x = 243
x = 873 + 243
x = 1116
h) x - 215 = 772
x = 215 + 772
x = 987