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### Given Information:
1. Each small rectangle has a perimeter of 21 cm.
2. The width of each small rectangle is \( x \

A large rectangle is made by joining three identical small rectangles as shown. The perimeter of one small rectangle is 21 cm. The width of one small rectangle is x cm. Work out the perimeter of the large rectangle.

Learn how to calculate the perimeter of a large rectangle formed by joining three identical small rectangles. The problem involves basic geometric concepts like perimeter and rectangle dimensions. Suitable for students in Grades 6-8.

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