For which rational numbers of a is the expression a-3/3: equal to 5/2 a is a positive number

For which rational numbers of a is the expression a-3/3: greater than 5/2 a is a positive number

For which rational numbers of a is the expression a-3/3: less than 5/2 a is a positive number

I need help cuz this i rsm and my class is in an hour *AND GIVE ALL ANSWERS!!!!!!!*