804:x=201, 4, 5, 300-(28•x)=160, 8, 5, 105:3•(16:x)=140, 6, 4, 684:x-(56+14)=101, 4, 7, 305:x-31=30, 8, 6, 5, 7, 343=x³, 6, 7, 11, 8.

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