With this math ! 25 points
what is value of x? enter your answer in the box. x =
a triangle with vertices labeled as a, b, and c. side b c is the base. a line segment is drawn from vertex a to base b c that bisects angle b a c into two parts marked with single arcs. side a b is labeled as 8. side a c is labeled as 12. side b c is divided into two equal parts labeled as x plus 4 and 2 x plus 1.

here is the picture of the problem