Final answer:
The value of the given expression is -32 when a = 8, b = 3 and c = 6.
Step-by-step explanation:
The given expression is 6a-2ac + 5b = 1. Substituting the values a = 8, b = 3, and c = 6 in the expression, we have 6(8) - 2(8)(6) + 5(3) = 1.
Simplifying the expression, we get 48 - 96 + 15 = 1.
Therefore, the value of the expression when a = 8, b = 3, and c = 6 is -32.