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Question
Solve for x in the following in equation, if the replacement set is N<10:
5 - 2x < 11
Solution
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}
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