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To find the value of x that makes 4x - 1 equal to 15, you can solve the equation.
Start by adding 1 to both sides of the equation:
4x - 1 + 1 = 15 + 1
This simplifies to:
4x = 16
Then, divide both sides of the equation by 4:
4x/4 = 16/4
This becomes:
x = 4
Therefore, the value of x that makes 4x - 1 equal to 15 is x = 4.