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sehingga
3x - 4 = x + 10
3x - x - 4 + 4 = x - x + 10 + 4
2x = 14
x = 14 : 2
x = 7
maka
AD = 3x - 4
AD = 3(7) - 4
AD = 21 - 4
AD = 17 cm
AD= 3x=4 = 3 . 7 -4 = 21-4 =17