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5x - 2x = 15 + 38
3x = 53
x = 17,67
langkah awal nya seperti itu kalo gak salah
5× - 38 + 2× + 15 = 180
7× - 23 = 180
7× = 203
× = 29
sudut B = sudut D = 2× + 15 = 2(29) + 15 = 58 + 15 = 73 derajat