Find all the numbers such that twice the number is 7 units from 11

Question

Find all the numbers such that twice the number is 7 units from 11

Answer 1

Case 1:

 

2x + 7 = 11

 

x = (11 - 7) / 2 = 2

 

Case 2:

 

2x - 7 = 11

 

x = (11 + 7) / 2 = 9

 

Both 2 and 9 meet the condition.