Answer:
AC = 24
Step-by-step explanation:
First you want to set up the equation to find what x equals which is AB + BC = AC
12x - 20 = x + 6 + 5x - 4
Then combine like terms and solve.
12x - 20 = x + 6 + 5x - 4
12x - 20 = 6x +2
+20 +20
12x = 6x + 22
-6x -6x
6x = 22
x = 11/3 or 3 2/3
Then plug in x to the AC equation.\
12(11/3) - 20
44-20
AC = 24
