Find the first step in finding the product \((3x + 2)(x - 5)\) by use of the distributive property in the form \(a(b + c) = ab + ac\). The original answer is in the form \((a+b)x + (a+b)(c)\). Please give the value of a + b + c.

Let's think step by step and output the final answer within \boxed{}.
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