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A triangle ABC is formed by three lines ...

A triangle ABC is formed by three lines `x + y + 2 = 0, x-2y + 5-0 and 7x + y-10 =0`. P is a point inside the triangle ABC such that areas of the triangles PAB, PBC and PCA are equal. If the co-ordinates of the point P are (a, b) and the area of the triangle ABC is `delta`, then find `(a + b + delta)`.

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