Answer:
B
Step-by-step explanation:
A is correct because
was added on both sides, which is supported by the Additive Property of Equality
C is correct because the Quotient Property of Logarithms states that 
so
is correct
D is correct because using the fact that
it is easy to figure out that x=12
For B, there is no property supporting that statement.
Without that value, we can't solve your problem, unless you are looking for an algebraic equation.
Answer:
-11
Step-by-step explanation:
-5 minus 6 equals -11. Look up on Google
Nine more than a variable "a".