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usia andi sekarang = y
x - 2 = 9 (y - 2) --> x = 9y - 16 ...(1)
x+3 = 4(y+3) --> x = 4y + 9 ...(2)
(1) = (2)
9y - 16 = 4y + 9
5y = 25
y = 5