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8 + x 4
20 + 4x = 24 + 3x
4x - 3x = 24 - 20
x = 4
jadi perbandingan umur mereka menjadi 3 : 4 setelah 4 tahun.
8+x=4
20 + x = x
24 + x = x
x = 24-20
x = 4