xC₄H₁₀+ y0₂--> wCO₂+ zH₂O says that

for every 4x Carbons on the left there are 1w Carbons on the right, 4x = w.

For every 10x Hydrogens on the left, there are 2z Hydrogens on the right, so 10x = 2z.

What equation would represent the Oxygens on the left and right