book Maths Puzzle Numerical Ability

1. 4n+5=6n+7
2. 5p-9=2p+12

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I need help doing this problem:
(4x + 3w^2)(4x - 3w^2) the length of a rectangle is decreased by 3 feet, and the width is increased by 1 foot, forming a square region havig an area of 25 square feet. what is the area of the orginal rectangle?