1 2y-7y=315

It seems like you're trying to solve an equation for y. Here is how you can solve it:

1 - 2y - 7y = 315

First, combine like terms (the terms with y): -2y - 7y = -9y

Now, your equation looks like this: 1 - 9y = 315

Next, you want to isolate the term with y by moving the constant term (1) to the other side of the equation. You do this by subtracting 1 from both sides: -9y = 315 - 1 -9y = 314

To solve for y, divide both sides of the equation by -9: y = 314 / -9

Now simplify the right side: y = -34.8888888889

So the solution to the equation 1 - 2y - 7y = 315 is approximately y = -34.89 (rounded to two decimal places).