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2(3x - 1 ) = 52
6x - 2 = 52
6x = 52+2
6x = 54
x = 54/6
x = 9
AB=DC = x + 7 = 9 + 7 = 16 cm (C)
BC = AD = 2x - 8 = 2(9) - 8 = 18 - 8 = 10 cm
2 (x+7 + 2x-8) = 52
3x - 1 = 52 / 2
3x = 26 + 1
x = 27/3
x = 9
CD = 9 + 7 = 16