Answer: The value of x is 6. The measure of angle B is 20 degrees.
Step-by-step explanation:
3x + 2 + 55 = 13x- 3
3x + 57 = 13x -3
-3x -3x
57 = 10x -3
+3 +3
60= 10x
x= 6
3(6) +2 = m∠B
20= m∠B
