In the equation provided, step 1 involves the transformation of \(6x - 5 = 76\) to \(6x - 5 + 5 = 7 + 5\). Here, 5 is added to both sides of the equation.
The property used in step 1 is the Addition Property of Equality, which states that if you add the same amount to both sides of an equation, the two sides remain equal.
Thus, the correct answer is:
Addition property of equality.