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n1 = 8
x2 = 12, x2 = 41,6 - 1,6 = 40
(n1+n2) xg = n1 x1 + n x2
20(41,6) = 8(x) + 12(40)
8x = 20(41,6 ) - 12(40)
8x = 352
x = 44 kg