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Umur Lili + 25 thn = 0 + 25 = 25 thn
Umur Lili dimisalkan y
x-y = 13
x+y = 25 (masing2 dikurangi)
-2y = -12
y = 6
x+y = 25
x+6 = 25
x = 25-6
x = 19
Umur Noni sekarang = 19 thn
Umur Lili sekarang = 6 thn