Question

543+x-105=1254

Answer 1

543+x=1254+105

543+x=1359

x=1359-543

x=816

Answer 2

x = 1254 + 105 - 543 

x = 816

Answer 3

543+x-105=1254

       543+x=1254+105

       543+x=1359

              x=1359-543

              x=816