Answer:
see explanation
Step-by-step explanation:
Vertical angles are congruent, hence
2z + 43 = - 10z + 25 ( add 10z to both sides )
12z + 43 = 25 ( subtract 43 from both sides )
12z = - 18 ( divide both sides by 12 )
z = [tex]\frac{-18}{12}[/tex] = - [tex]\frac{3}{2}[/tex]
