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=17+x
lebar krton = 12+2+2
= 14
pnjng karton/pnjng foto=lebar krton/lbr foto
17 + x/15= 14/12
17 + x/15= 7/6
6(17 + x)= 7 x15
102+ 6x= 105
6x= 105-102
6x= 3
x=3/6=1/2