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To solve the equation 4x - 1 = 15, you need to isolate the variable x. First, add 1 to both sides of the equation to get rid of the constant -1:
4x - 1 + 1 = 15 + 1
4x = 16
Next, divide both sides of the equation by 4 to solve for x:
4x/4 = 16/4
x = 4
Therefore, the value of x that makes 4x - 1 equal to 15 is x = 4.