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Verified answer
Ya udah tk tulis lg.lebar foto=lf=24-6=18
panjang foto=pf=a-7
lk=24,pk=a
lf/lk=pf/pk
18/24=a-7/a
18a=24(a-7)
18a=24a-168
168=24a-18a
168=6a
a=168/6=28 cm
udah tk jwb d koMentar profilmu lho..he^_^