12y-9=843

To solve the equation \( 12y - 9 = 843 \), follow these steps:

1. Add 9 to both sides of the equation:

   \[ 12y - 9 + 9 = 843 + 9 \]

   This simplifies to:

   \[ 12y = 852 \]

2. Now, divide both sides by 12 to solve for \( y \):

   \[ y = \frac{852}{12} \]

   Calculating the division:

   \[ y = 71 \]

So the solution is:

\[ y = 71 \]