book Maths Puzzle Numerical Ability

How do I simp (x+2)-(x-2)-12x?

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PQRS in a parallelogram,Q and S are joined to any point M on the diagonal PR of the parallelogram.Prove that area of the triangle PQM=area of triangle PSM The length of a rectangle is 3x+4y feet, and the width is 2x-3y feet. compute the perimeter and the area.