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luas arsir = luas abcd - luas efgh
7600 = (ab×bc) - (ef×fg)
7600 = (130×bc) - (30×50)
7600 = (130×bc) - 1500
7600 + 1500 = (130×bc)
9100 = 130×bc
9100 : 130 = bc
70 = bc
jadi lebar abcd adalah 70 cm
maaf kalo salah