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The equations of adjacent sides AB and ...

The equations of adjacent sides `AB and AD` of a parallelogram ABCD are `3x - 4y+21=0 and 4x - 3y - 14 = 0` respectively. The perpendicular distances between the parallel sides `AB, DC and AD, BC` are `14/5 and 75/5` respectively. If the area of parallelogram is 2k. Find the value of k.

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