Those lines mean absolute value which always positive.
|-3| + 7 could be re-written as 3 + 7
|-3 + 7| could be re-written as 3 + 7
3|–3x + 9| = –18
divide both sides by 3
|–3x + 9| = –6
<span>absolute value cannot be a negative number</span>
<span>Answer: No solutions</span>
Answer
r = -20
Step-by-step explanation
4r-8=5r+12
subtract 4r from both sides of the equation
-8=r+12
subtract 12 from both sides of the equation
-20 = r
