Question

Solve for x in the following in equation, if the replacement set is N<10: 

5 - 2x < 11 

Answer 1

 5 - 2x < 11

5-2x < 11

⇒ -2x < 11-5

⇒ -2x < 6

⇒ x > -3 

But { x : x E N; N < 10} 

Therefore, solution set x = { 1,2,3,4,5,6, 7 ,8, 9}