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3x-\frac{6x-7}{3}=\frac{2}{5}. The solution of this equation is? Thankyou in advanced.

From maths in focus extension 1 book by margaret grove: ex 11.7 question 14. Find the equation of the tangent at (8,4) on the parabola x^2=16y. This tangent meets the tangent at the vertex of the parabola at point R. Find the coordinates of R. i got the equation but had no idea how to find...