book Maths Puzzle Numerical Ability

(X+1)/7 - (X-3)/5 = 4/5

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my questions is
a rectangle is 5 times as long as it is wide. the difference of its length and the width is 9 inches. find its perimeter.

thanks for the help which one is the correct one? "the square of four more than a number,"

X+4 (2) or (x+4)2 why?