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This study aims to analyze students mistakes in solving algebraic questions and to find out the opinions of students about the interest in learning mathematics. The research approach taken is qualitative with descriptive method. The instruments used consisted of problem solving questions and interview guidelines. Tests carried out by students are given a score and an analysis of error answers is carried out. The study was conducted on class VIII students in one of the Public Middle Schools in West Bandung Regency. The tests carried out include several stages, namely the understanding stage, the transformation stage and the process skill stage. The results of the study show that most students have difficulty working on question number 3 with process skill indicators. After interviews, students said they did not understand the algebraic concept well and how to transform the problem into algebraic threads. So that it can be concluded that the error of class VIII students in one of the State Junior High Schools in West Bandung in solving algebraic form problems is in the lack of understanding the basic concepts of algebra. It is suggested that the learning process should use learning strategies that can improve students understanding of the basic concepts of matter. However, 61.38% of students have positive opinions on mathematics.