12y-7y=315

To solve the equation 12y - 7y = 315, you can start by combining the like terms on the left-hand side (those terms that contain the variable y).

Here's how you do it step by step:

12y - 7y equals 5y because you subtract 7y from 12y (12-7 is 5).

So now your equation is:

5y = 315

To solve for y, you divide both sides of the equation by 5:

5y / 5 = 315 / 5

y = 63

Therefore, y equals 63.