7. Each of the three figures represents a number, and the two figures are nested together. If they are in contact, it means subtracting external graphics from internal graphics; If they don't touch, it means that the two numbers add up. From this, the equations can be listed: positive+circle = 3; Rounding-positive =1; +three = 6; Sanzheng = 4; Get, positive = 1, circle =2, and three =5. So the fifth figure should be three+circles =5+2=7.