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perlu pembuktian?
misalkan bilangan bilangan itu : a, a + 2, a + 4
a + (a + 4) =?
a + (a + 4) = 2( a+2) = 2/3
a+a+2+a+4 3(a + 2)
jadi nilai nya = 2/3 * 42 = 28