Answer:
what
Step-by-step explanation:
is that you want to use
Answer:
-|b| < b
Step-by-step explanation:
-b where?
Answer:
1,2,3
Step-by-step explanation:
you can't have half of a dog so it is all the whole numbers
Answer:
The step 4 is not what he should have done. But the wrong is step 5, because if he added -2x both sides, it would give the following equation:

and not 
Note that in step 4 he should have added 2x and not -2x to both sides, but we still have the equality. The problem is that step 5 is totally wrong.
I don't know what answer is expected to this question, but I would mark step 5, because this is mathematically wrong.
Solving the equation

Using distribution

Add
both sides


Add 12 both sides

Divide both sides by 5
