Answer:
To find the value of "a" in the equation "a - 12 = 15", we can solve for "a" by isolating it on one side of the equation.
Starting with the equation "a - 12 = 15", we can add 12 to both sides of the equation:
a - 12 + 12 = 15 + 12
This simplifies to:
a = 27
Therefore, the value of "a" is 27.
In the second part of the question, you have "15 - a = __". Substituting the value of "a" as 27, we can evaluate it:
15 - 27 = -12
Therefore, the value of "15 - a" is -12.
Explanation: