Помогите расставить коэффициенты!!!!
а) MgCO3=MgO+CO2
b) Mg+HCl=MgCl2+H2
c) Al+S=Al2S3
d) MgCl2+NaOH=Mg(OH)2+NaCl&
СРОЧНО!!!!!!!!!! Плиз!!!!!
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