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Kakak = x
adik = y
* x=4y
**(x+9)+(y+9)=33 => x+y+18=33 => x+y = 15
x-4y=0
x+y=15 (disubtitusikan)
-5y = -15
y = 3
x+y = 15
x+3=15
x=12
Jadi, umur kakak=12tahun dan adik=3tahun