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-5,6 x 3/4 = -56/10 x 3/4 = 168/40 = 42/10 = -4,2
-4,2 x 2 2/5 = -42/10 x 12/5 = -504/50 = -252/25 = 1008/100 = -10,08
-10,08 x 3/4 = -7,56
Odp: -7,56
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