7. In triangle ABC, the length of side BC is greater than the length of side AB by 3 cm
but is less than the length of side AC by 2 cm. If the perimeter of the triangle is
53 cm, find the length of the greatest side of traingleABC.
(1) 16 cm (2) 18 cm (S) 20 cm (4) 21 cm
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(3) 20 cm
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