Equation practice with angle addition

Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation.

Problem

Given
space, m, angle, A, O, C, equals, 108, degree
space, m, angle, A, O, B, equals, 3, x, plus, 4, degree
space, m, angle, B, O, C, equals, 8, x, minus, 28, degree
Find m, angle, A, O, B:
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i
degree
Get 3 answers correct in a row