exam Maths Puzzle Numerical Ability

Find the LCD for the given rational expression, and convert the rational expression into an equivalent rational expression with the LCD as the denominator.

4/x-y, 5x/2y-2x

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exam Other Question

I need to form the following:

1. a linear equation in one variable
2. a linear equation in two variables

and I need to plot the above in a graph. To solve 1/x-3+ 1/x+3 = 10/x^2-9, which step would result?

I got: (x+3)+(x+3) = 10

Is this correct?
Thanks~