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point z is the incenter of triangle rst.

point z is the incenter of triangle s r t. lines are drawn from the points of the triangle to point z. lines are drawn from point z to the sides of the triangle to form right angles and line segments z a, z b, and z c. angle a s z is (5 x minus 9) degrees and angle z s b is 16 degrees.

what is the value of x?

a. x = 2

b. x = 3

c. x = 5