“…Some relevant studies (e.g., Jupri, Drijvers & van den Heuvel-Panhuizen, 2014;Malihatuddarojah & Prahmana, 2019) show that students in Indonesia made mistakes in solving problems about algebraic operations such as in variables, negative signs, solving algebraic equations, algebraic operations, and solving fractions. Moreover, students' deficiencies in algebraic thinking are on (1) interpreting information from the word problem to mathematical language, (2) comprehending the given information and the question in the problem, (3) combination of logic and concept they have learned when solving the problem (Muthmainnah et al, 2017) Some studies (Cai et al, 2011;Walkington, Sherman & Petrosino, 2012;Fakhrunisa & Hasanah, 2020;Cahyaningtyas, Novita & Toto, 2018;Andini & Suryadi, 2017) use generational activities problems to identify students' difficulties in algebraic thinking. By analyzing students' answers when they solve it, they found that students have difficulty in interpreting and representing quantitative relationships, especially those involving relational proportion (Cai et al, 2011;Walkington et al, 2012;Fakhrunisa & Hasanah, 2020), obtaining information from the questions given, so students had difficulty predicting patterns and information chunking (Cahyaningtyas et al, 2018;Andini & Suryadi, 2017), and students are not accustomed to seeing the rules that exist in generalizing the pattern (Andini & Suryadi, 2017).…”