Question

123 + x = 123 + 77

Answer 1

123 + x = 123 + 77

=> x = 77

Answer 2

123 + x = 123 + 77

123 + x = 200

          x = 200 - 123

          x = 77

Answer 3

123 + x = 123 + 77

123 + x = 200

          x = 200 - 123

          x = 77

Answer 4

123+x=123+77

123+x=200

x=200-123

x=77

Answer 5

123 + x = 123 + 77

123 + x = 200

          x = 200 - 123

          x = 77

Answer 6

123+x =123 + 77

123 + x = 200

x = 300-123

x =77

Answer 7

123 + x = 123 + 77

123 + x = 200

    x       = 200 - 123

  Vậy  x       = 77