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330+X-54 = 321
276+x =321
x=321-276
x=45 (A)
55 = x / 6
x = 55 . 6
x = 330
53,5 = (330-54+y) / 6
53,5 . 6 = 276 + y
321 = 276 + y
y = 321 - 276 = 45 kg