А-9=75

To solve the equation a - 9 = 75 for a, you need to isolate the variable a on one side of the equation. You do this by adding 9 to both sides of the equation to cancel out the -9 attached to a:

a - 9 + 9 = 75 + 9

The nines on the left side cancel each other out, leaving you with:

a = 75 + 9

Now, you add 75 and 9 together to get the value of a:

a = 84