Помогите расставить коэффициенты в уравнениях реакций методом ОВР NH4Cl + AgNO3 = AgCl + NH4NO3
(NH4)2SO4 + BaCl2 = BaSO4 + NH4Cl
(NH4)2CO3 + HCl = HN4Cl + H2O + CO2
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