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x+y+z=45
x=y-1
z=y+1
maka
x+y+z=45
y-1+y+y+1=45
3y=45
y=15
maka
bilangan terbesar = 15+1 = 16
bilangan terkecil = 15-1 =14
jumlah 3a+6=45
3a=39 ... a=13, bila 13.15.17 terkecilnya =13