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y=kelompok B
71 * X + 76 * 12
------------------------- = 74
x + y
71X+912
------------- = 74
X + 12
71X + 912 = 74(x + 12)
71X + 912 = 74X + 888
912-888 = 74x - 71x
24 = 3x
x = 8