7-x=-18

7 - x = -18

To solve this equation, we can isolate the variable x by performing inverse operations.

First, let's get rid of the constant on the left side. We do this by adding x to both sides:

7 - x + x = -18 + x

Simplifying, we have:

7 = -18 + x

Next, let's eliminate the constant on the right side by subtracting -18 from both sides:

7 - (-18) = -18 + x - (-18)

Simplifying further, we get:

25 = x

Therefore, the solution to the equation 7 - x = -18 is x = 25.

Ответ: x = 25.