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A2=Z+7=6+7=13
m at. = A1*X1% + A2*X2% +... +An*Xn/100%
12,01 = 12*X+13(100-X)/100
1201 = 12*X + 1300 - 13*X
X=99
czyli
¹²C = 99%
¹³C = 1%