5x-9=-3x-12+5x
-5x -5x
-9=-3x-12
+12 +12
3=-3x
÷-3 ÷-3
-1=x
The equation of a circle:

(h, k) - a coordinates of the center
r - a radius

Answer: B. (–5, 7); 3
The answer to the question is c
A quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression (e.g. 3 in 23 = 2 × 2 × 2).