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Umur anak: B
(A - 2) = 6(B - 2)
A - 2 = 6B - 12
A = 6B - 10
(A + 18) = 2(B + 18)
A + 18 = 2B + 36
A = 2B + 18
6B - 10 = 2B + 18
4B = 28
B = 7
A = 6B - 10 = 42 - 10 = 32
Umur ayah 32th
Umur anak 7th
Semoga membantu :)