Find an equation for the line tangent to the curve at the point defined by the given value of t.​ Also, find the value of d2y / dx2 at this point. x​ = 1/ (t +4), y = t/ (t-4)​, t = 5 Write the equation of the tangent line y = ? ​(Simplify your answers. Use integers or fractions for any numbers in the​ expression.)

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