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If b ≠ 0 then b > 0 (positive) or b c/b. Lets say b = 1 then a > c. Now lets say b = 1, then a > c. Multiply by 1. a 6bc.
Lets say b = 1, then 5a > 6c. 5(1/5)a > 6(1/5)c . a > 1.2c so a > c.
Now lets say b = 1 , then 5a > 6c. Multiply by 1 5a < 6c. a c or a < c. Insufficient.
Answer is E.