4 x = 36
Step-by-step explanation:
Because the groups have an equal number of students, we assume that each of the groups has x number of students.
Therefore since there is x number of students in each of the 4 groups, there is 4 * x number of total students in all groups combined.
Since the question already indicates that there are a total of 36 students in the class, then we can indicate that..
4x = 36