Solve the equation. \[ y-12=4 y \]

Step 1 ：The given equation is \(y-12=4y\).

Step 2 ：Subtract 4y from both sides of the equation to get \(-3y = 12\).

Step 3 ：Divide both sides by -3 to solve for y, giving us \(y = -4\).

Step 4 ：The solution to the equation is \(\boxed{-4}\).