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38 = 2 (x+7+2x-3)
38 = 2 (3x+4)
38 = 6x + 8
6x = 38 - 8
6x = 30
x = 30/6
x = 5 cm
lebar = 2x-3
= 2(5)-3
= 10 - 3
= 7 cm