**Step-by-step explanation:**

Given expression: 6(2b-4)

To find the value of 6(2b-4) at b= 5, we need to substitute the b=5 in the expression, we get

6(2b-4) = 6(2x5-4) [Putting the value of b as 5]

=6(10-4) = 6(6) =36

Therefore, the value of is 36, when b=5.

**Answer: The value of 6(2b-4) when b =5 is 36.**

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