Hey there!
Assuming you want us to balance the equation:
Zn + HCl → ZnCl₂ + H₂
Balance Zn.
1 on the left, 1 on the right. Already balanced.
Balance H.
1 on the left, 2 on the right. Add a coefficient of 2 in front of HCl.
Zn + 2HCl → ZnCl₂ + H₂
Balance Cl.
2 on the left, 2 on the right. Already balanced.
Our final balanced equation:
Zn + 2HCl → ZnCl₂ + H₂
Hope this helps!