Answer:
Initial equation:
C₃H + O₂ → CO₂ + H₂O.
Balanced equation:
4C₃H + 13O₂ → 12CO₂ + 2H₂O
Evaluating final balanced equation:
12 C 12
4 H 4
26 O 26
Tips: Start with the metals, then with no metals and finally with the gases, in case you have oxygenated that last balance.
Gud luck!!