Step 1: Analyze the composition.
In the image, we need to identify the number of triangles, circles, and rectangles. After counting:
- The number of triangles = 7
- The number of circles = 5
- The number of rectangles = 1
Step 2: Difference between triangles and circles.
The difference between the number of triangles and circles is:
\[
7 - 5 = 2
\]
Step 3: Division by rectangles.
Now, divide the difference by the number of rectangles:
\[
\frac21 = 6
\]
Step 4: Conclusion.
The final result is \( \boxed6 \).