Balance the chemical equations
`PbO+NH_3 to Pb + H_2O + N_2`

Explanation

To balance the chemical equation \( \text{PbO} + \text{NH}_3 \rightarrow \text{Pb} + \text{H}_2\text{O} + \text{N}_2 \), we will follow these steps:

### Step 1: Write down the unbalanced equation
The unbalanced equation is:
\[ \text{PbO} + \text{NH}_3 \rightarrow \text{Pb} + \text{H}_2\text{O} + \text{N}_2 \]

### Step 2: Count the number of atoms of each element on both sides
- **Left-hand side (LHS)**:
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