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y=3+z
x=5+z
x+y+=38
(5+z)+(3+z)+z=38
8+3z=38
3z=30
z=10
x=5+z=5+10=15
jadi umur x adalah 15 tahun
x=y+2=z+3+2=z+5
x+y+z=38
z+5+z+3+z=38
3z+8=38
3z=30
z=10
x=z+5= 10+5 = 15 tahun