1. The problem is to calculate $60 - 84$. 2. The subtraction formula is $a - b = c$, where $a$ and $b$ are numbers and $c$ is the result. 3. Here, $a = 60$ and $b = 84$. Since $b$ is greater than $a$, the result will be negative. 4. Calculate the difference ignoring the sign: $84 - 60 = 24$. 5. Since $b > a$, the result is $-24$. Therefore, $60 - 84 = -24$.