If the equations of the diagonals of the...

If the equations of the diagonals of the parallelogram formed by the lines, `2x - y + 7 = 0; 2x - y - 5 = 0; 3x + 2y - 5 = 0 and 3x + 2y + 4 = 0` are `ax + by - 5 = 0 and px + qy + 1 = 0.` Find the value of `(a+b+p+q).`

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