This study is based on an interest in trying to understand what is needed to ensure that students actually learn in a learning object, in this study equations. Algebra is an area of mathematics in several studies proved to be a stumbling block for many students. Using letters in mathematis is difficult for most students according to research reports and it is also consistent with my own experince as a teacher. The purpose of this study was to seek answers to what in the lesson content and also during the interview that allowed the students to learn more about the learning object. Based on students' prior knowledge and the difficulties students might have with the learning object and the offer of learning, I try to get an answer to what might have contribut the students to developed knowledge of the learning object. This qualitative study is based on a variation theory perspective. The two students who participated in the study attended the same class in high school. By using the theory of variation patterns, it made it possible for me to describe how students learn new things about the learning object, equations. To gain insight into how the students solved the data and developed new knowledge, I had the lesson content and their statements in the interviews to help me understand the difficulties in solving the equtionatask and what in the lessons that have contributed to new knowledge. The results show that pupils' understanding and difficulties in learning objects are relevant to how they can perceive, discern and assimilate new knowledge. One student was able to experience learning from their prior knowledge and assimilate what he had to develop in the variety in the offer of learning. The offered learning did not give the second student the same opportunity. The results indicates that the knowledge of students' prior knowledge, the difficulties the learning object can create and students' own narrative, I argue on the basis of the study'sresults, it is important knowledge for every teacher to be aware of befor the presentation of the lesson if it will give every student opportunities to learn.