Formative Assessment 31

Assessment Problem: 

Is there a value for x that will make the following statement true?
(6x-8-15x)+12>(6x-8-15x)+6

Mathematical Issues: 

This task encourages students to think intuitively about the problem rather than resort to formal procedures.

Common Responses: 

(something) + 12 > (something) + 6
(something) + 6 > (something)
This is always true

Domain: 
Algebraic Relations
Theme: 
Inequalities
Research References: 
(Lim, 2006)