X - 637 = 125 x 6
X= X - 637 = 750
X= 750 + 637
X= 1387
X + 174 = 3168 : 9
X= X + 174 = 352
X= 352 - 174
X = 178
x - 637 = 750
x = 750 + 637
x = 1387
x + 174 = 352
x = 352 - 174
x = 178
X - 637 = 125 x 6
X - 637 = 750
X =750 + 637
X = 1387
X + 174 = 3168 : 9
X + 174 = 352
X = 352 - 174
X = 178