( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 210 ) + ( x + 211 ) = 23632
x + 1 + x + 2 + x +3 + .... + x + 210 + x + 211 = 23632
( x + x + x + .... + x ) + ( 1 + 2 + 3 + ... + 210 + 211 ) = 23632
211x + 22366 = 23632
211x = 23632 - 22366
211x = 1266
=> x = 1266 : 211 = 6
Vậy x = 6