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16(12)(z)/(16(12)+16(z)+12(z)) = 4
192z/(192 + 28z) = 4
192z/4 = 192 + 28z
48z = 192 + 28z
48z - 28z = 192
20z = 192
z = 192/20 = 9,6 hari
1/16 + 1/12 + 1/z = 1/4
3/48 + 4/48 + 1/z = 1/4
7/48 + 1/z = 12/48
1/z = 12/48 - 7/48
1/z = 5/48
z = 48/5
z = 9 3/5 atau 9,6