If b(a-b)+5(b-a)=5-b and b \neq 5, which of the following must be true?

GMAT Quantitative Reasoning Practice Test 5

Question : 60 of 100

Marks: +1, -0

b(a-b)+5(b-a)=5-b

and

b ≠ 5

, which of the following must be true?

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