Question

x+7+6=80

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Answer 1

x+13=80

x      =80-13

x       =67

Answer 2

x + 7 = 80 - 6

x + 7 = 74

      x = 74 - 7

      x = 67

Answer 3

x + 7 + 6 = 80

x = 80 - 6

x = 74 - 7 

x = 67

Vậy x = 67

Answer 4

x+7+6=80

x+7   =80-6

x+7   =74

   x   =74-7

  x=67