$18=-3 y-12$
The solution to the equation \(18=-3 y-12\) is \(y = \boxed{-10}\).
Step 1 :Start with the equation \(18=-3 y-12\).
Step 2 :Add 12 to both sides of the equation to get \(30=-3y\).
Step 3 :Divide both sides by -3 to solve for y, yielding \(y=-10\).
Step 4 :The solution to the equation \(18=-3 y-12\) is \(y = \boxed{-10}\).