And somehow we put in only two O atoms and we get three O atoms back. This type of an equation where our numbers are unbalanced, our coefficients and atoms are imbalanced, is known as an unbalanced equation. To balance this equation, we basically have to multiply each atom by some number so that the number on this side of each atom equals the number on this side. So let's balance this out. Now, let's begin with carbon. Now, on this side, we have two carbons, while on this side, we only have one carbon.