exam Maths Puzzle Numerical Ability

Rational Expressions

add
7 + [1/(x - 5)]

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exam Other Question

x+y=-4
_______
x-y=2

I am trying to figure out the method you use to solve this problem. The instructions says to solve using the addition method. find out the value of x and The area of a rectangle of length x is given by 3x^2+5x. Find the width of the rectangle.