Decide Whether the Equation Is an Identity, a Conditional Equation $$- 0.9 ( x + 9 ) + 0.1 ( x + 9 ) = - 0.8 x - 7.2$$

Multiple Choice

Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.
- $$- 0.9 ( x + 9 ) + 0.1 ( x + 9 ) = - 0.8 x - 7.2$$

A) Conditional; $\{ - 0.8 \}$
B) Identity; {all real numbers $\}$
C) Contradiction; $\varnothing$
D) Conditional; $\{ - 9 \}$