(ab)x−2=(ba)x−7. What is the value of x ? Choices.
A) 1.5  B) 4.5  C) 7.5  D) 9.5  E) 8.7
Explanation:   (a/b)x−2=(b/a)x−7⇒(a/b)x−2=(a/b)−(x−7)⇒x−2=−(x−7)⇒x−2=−x+7⇒x−2=−x+7⇒2x=9⇒x=92=4.5   Option 4.5
<result>B</result>
(ab)x−2=(ba)x−7. What is the value of x ?