exam Maths Puzzle Numerical Ability

The length of a rectangle is 1 inch. less than twice the width. the area of the rectangle is 21 spuare inches. What is the length of the rectangle.

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I just want the derivation of following formula

The annual payment of debt of Rs. P in t years in equal installments at the rate of interest R% per annum when equal installment
Chapter:The Elimination Method
2x+4y=40
7x-3y=4