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In the figure below, the line is tangent to the circle at $(3,-4)$ in the x-y coordinate plane.
If the center of the circle is the origin $(0,0)$, what is the equation of the line?
$4x + 3y = 1$
$4x – 3y = -1$
$3x – 4y = -25$
$3x + 4y = 7$
$3x – 4y = 25$