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y = 28 + a
a + y = 48
a + 28 + a = 48
2a = 20
a = 20/2= 10 th
ayah = x
anak = x-28
jumlah = 48 tahun
x+(x-28) = 48
2x-28 = 48
2x = 48+28
2x = 76
x = 38
Ayah = x
= 38 tahun
Anak = x-4
= 38 tahun - 28 tahun
= 10 tahun