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10+20+10+40=80 --> 10+20+10+20+20=80
Se multiplica el coeficiente por el sub-indice
- 4Fe+3O2 ----> 2Fe2O3
4+6=10 ------> 4+6= 10
-16HCL+ 2KMnO4--> 2KCL+ 2MnCL2+ 8H2O+ 5 Cl2