3x+1/2=9 1/2

A x=-3
B=x=3
C=x=-10/3
D=x=10/3

B = x = 3

Step-by-step explanation:

Isolate the variable by diving each side by factors that don't contain the variable.

hi friend

here is your answer

there are two angles that are alternate interior angle with angle 9

the angle 15 and angle 7 are alternate interior angle with angle 9.

hope it is for you so mark my answer as a brainliest