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Given: ABC is bisected by ray BD.
ABD = 8(x+4), and m DBC = 64
 
Prove: x = 4
      Statement:                                     Reason:
1. BD bisects ABC                   1. Given
2. m ABD = m DBC                2. Definition of Bisector
3. m ABD = 8 (x+4)                   3. Given
4. m DBC = 64                            4. Given
5. 8 (x+4) = 64                              5. Substitution
7. 8x+32 = 64                              7.Distributive Property
8. 8x = 32                                     8. [?]
9. x = 4                                         9. 
 
Select the reason that best supports Statement 8 in the given proof.
A. Subtraction Property of Equality
B. Addition Property of Equality
C. Multiplication Property of Equality
D. Division Property of Equality

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