Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: Calcula 20·x - 8·x + 9·x - 12·x=: 7·x; 9·x
Right answer summary: 9·x
Question state: todo
Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: Calcula 20·x - 8·x + 9·x - 12·x=: 7·x; 9·x
Right answer summary: 9·x
Question state: todo