10-d=19

What is d?
I think it is -9.

Right.

Thanks

You're welcome.

To find the value of d in the equation 10 - d = 19, you can solve for d by isolating it on one side of the equation. Here's how to do it:

Step 1: Start with the given equation: 10 - d = 19.

Step 2: To isolate d, you need to get rid of the 10 on the left side of the equation. You can do this by subtracting 10 from both sides of the equation:

10 - 10 - d = 19 - 10.

This simplifies to:

0 - d = 9.

Step 3: Now, to solve for d, you need to get rid of the coefficient -1 in front of d. You can do this by multiplying both sides of the equation by -1:

-1(0 - d) = -1(9).

This simplifies to:

0 -(-d) = -9.

-(-d) simplifies to d since the double negative cancels out.

So, you're left with:

0 - d = -9.

Step 4: Now, you have:

-d = -9.

Step 5: To solve for d, you can multiply both sides of the equation by -1 (or divide by -1) to get the value of d:

(-1)(-d) = (-1)(-9).

This simplifies to:

d = 9.

So, the value of d in the equation 10 - d = 19 is 9.