Hey there!
C₆H₁₄ + O₂ → CO₂ + H₂O
Balance H.
14 on the right, 2 on the left. Add a coefficient of 7 in front of H₂O.
C₆H₁₄ + O₂ → CO₂ + 7H₂O
Balance C.
6 on the left, 1 on the right. Add a coefficient of 6 in front of CO₂.
C₆H₁₄ + O₂ → 6CO₂ + 7H₂O
Balance O.
2 on the left, 12 on the right. Add a coefficient of 6 in front of O₂.
C₆H₁₄ + 6O₂ → 6CO₂ + 7H₂O
Our final balanced equation: C₆H₁₄ + 6O₂ → 6CO₂ + 7H₂O
Hope this helps!