def scaleBack(x, x_min, x_max):
    """
    Scale the x back to  normal

    Parameters
    ----------
    x : float
        x
    x_min : float
        min value of x
    x_max : foat
        max value of x

    Returns
    -------
    output: float
        output X

    """
    return (x_max - x_min) * x + x_min