Solve for d.9 + 2 + d = –d − 1

Sure, let's solve the equation step by step.

1. First, let's simplify the equation by combining like terms on each side. On the left side, we have 9 + 2 + d which simplifies to 11 + d. The equation now reads: 11 + d = -d - 1.

2. Next, let's get all the terms with 'd' on one side of the equation and the constants on the other side. We can do this by adding 'd' to both sides of the equation. This gives us: 11 + 2d = -1.

3. Finally, let's solve for 'd' by subtracting 11 from both sides of the equation. This gives us: 2d = -12.

4. To get 'd' by itself, we divide both sides of the equation by 2. This gives us: d = -6.

So, the solution to the equation 9 + 2 + d = -d - 1 is d = -6.