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Start with the given inequality

Add 3 to both sides.
Break up the absolute value (remember, if you have

, then

and

)

and

Break up the absolute value inequality using the given rule

Combine the two inequalities to get a compound inequality

Subtract 2 from all sides

Divide all sides by 5 to isolate k
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Answer:
So our answer is
which looks like this in interval notation
note: since the inequality was less than or
equal to, that means the end points are included. So that is why brackets are used instead of parenthesis.