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y= saudara perempuannya
* selisih usia
x = y + 6
x - y = 6
* tujuh tahun lalu
x - 7 = 2 (y - 7)
x - 2y = - 7
x - y = 6
x - 2y = - 7
dikurangkan
hasilnya
y = 13
x = y + 6 = 13 + 6 = 19
umur sandro adl 19 tahun