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umur ibu lebih muda 3 tahun dari umur ayah berarti = x - 3
jumlah umur mereka 67
x + (x-3) = 67
2x - 3 = 67
2x = 67 + 3
2x = 70
x = 70/2
x = 35
jadi umur ibu = x - 3
= 35 - 3 = 32