1. The problem is to solve the equation $x - 12 = 7$ using the unitary method. 2. The unitary method involves finding the value of one unit and then using it to find the value of the unknown. 3. Here, the equation $x - 12 = 7$ means that when 12 is subtracted from $x$, the result is 7. 4. To find $x$, add 12 to both sides of the equation: $$x - 12 + 12 = 7 + 12$$ 5. Simplifying both sides gives: $$x = 19$$ 6. So, the value of $x$ is 19. This is a straightforward application of the unitary method where we isolate the variable by performing inverse operations.