Answer:
a) 8
Step-by-step explanation:
a // b and c is transversal
So, alternate exterior angles are congruent.
12x - 12 = 10x + 4
Add 12 to both side
12x = 10x + 4 + 12
12x = 10x + 16
Subtract 10x from both sides
12x - 10x = 16
2x = 16
Divide both sides by 2
x = 16/2
x = 8
