12-x=7

12 - x = 7 To solve this equation, we need to isolate the variable x.

To do that, we can start by subtracting 12 from both sides of the equation:

12 - x - 12 = 7 - 12

Simplifying:

-x = -5

Now, to isolate x, we can multiply both sides of the equation by -1:

(-1) * (-x) = (-1) * (-5)

Simplifying:

x = 5

Ответ: x = 5