Fehler:
HCl %2B Na2B4O7*10H2O %3D H2O %2B NaCl %2B H3BO3
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Unerwartets Zeichen ('%')HCl %2B Na2B4O7*10H2O %3D H2O %2B NaCl %2B H3BO3
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Unerwartets Zeichen ('%')