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jadi x+(×+2)+(×+4)=105
3×+6=105
3×=99
×=33
bilangan 1 = n-2
bilangan 2 = n
bilangan 3 = n+2
maka, didapat :
n-2 + n + n+2 = 105
n+n+n-2+2 = 105
3n = 105
n = 105/3
n = 35
sehingga :
bil. terkecil = n-2 = 35-2 = 33
bil. terbesar = n+2 = 35+2 = 37
jadi, jumlah bil.terkecil dan terbesar = 33+37 = 70