Abstract
Personal style can influence the students’ thinking process in solving mathematics problems.This study aims to describe the thinking process of students in solving the problem of equations and inequality of linear one variable in terms of student's personal style. This study uses a qualitative method. The research data was obtained by giving personality test sheets, math test sheets, and interviews to five subjects who have different ways of solving problems and personal styles. Based on the results of the study, extroverted and introverted students tend to use the process of assimilation thinking in solving the problem.