Sagot :
Cevap:
23
Adım adım açıklama:
hakan x
erkan 3x-28
11 yıl önce
hakan x-11
erkan 2.(x-11)= 2x -22
3x-39=2x-22
x=17
erkanın bugünkü yası = 3x-28= 51- 28=23
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