Answer:
C
Step-by-step explanation:
Since ΔABC is isosceles then BC = AC, that is
5x - 25 = 2x - 7 ( subtract 2x from both sides )
3x - 25 = - 7 ( add 25 to both sides )
3x = 18 ( divide both sides by 3 )
x = 6
Hence
AC = 2x - 7 = (2 × 6) - 7 = 12 - 7 = 5 → C
