Answer:
The value of x= 12.
Explanation:
Given two parallel lines b nd c are crossed by a transversal line 'a'.

By linear sum property

By subtraction property of equality
We get y=

By simplification

b and c are parallel lines and cut by transversal line a then alternate interior angles are equal.

By subtraction property of equality
5x=60

By division property
x=12
Hence, the value of xis 12.