(x-31)•12=600

To solve the equation \((x - 31) \cdot 12 = 600\), follow these steps:

1. Divide both sides by 12 to isolate the term with \(x\):

   \[ x - 31 = \frac{600}{12} \]

   \[ x - 31 = 50 \]

2. Next, add 31 to both sides to solve for \(x\):

   \[ x = 50 + 31 \]

   \[ x = 81 \]

So, the solution is \(x = 81\).