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lina=l
d=4l
d-l = 33
l = ?
jawab:
d-l = 33
4l-l =33
3l = 33
l = 33/3
jadi umur lina = 11 tahun
umur dani : 4x umur lina
umur lina = 4l - l = 3l
umur lina = 3l = 33
l= 11 tahun