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38 = 2 (x+7) + 2 (2x-3)
38 = 2x + 14 + 4x -6
38-14 + 6 = 2x + 4x
30 = 6x
x =
=5
l = 2x - 3
= 2 (5) -3
= 10-3
= 7 cm