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[ 63x-65x +6500 ] /100=63,55 I *100
63x-65x +6500= 6355
-2x = 6355 - 6500
-2x = -154 I/-2
x=72,5
100 -72,5= 27,5
zawartość procentowa izotou 63 wynosi 72,5% natomiast izotopu 65 wynosi 27,5% Szukany pierwiastek to miedź(Cu)