Answer:
See explanation
Explanation:
a + x = 180 ==> x and a are complementary or they are angles that are on a
straight line.
A straight line is a 180-degree angle called a straight angle
a + b + c = 180
a + x = a + b + c ==> since both expressions equal 180, both expressions
are equal to each other
a - a + x = a - a + b + c ==> subtract a on both sides
x = b + c √√