exam Maths Puzzle Numerical Ability

(4a/a^2-ab-2b^2)-(6b/a^2+4ab+3b^2)

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I have no idea how to type in math problems - (i.e., Squared, etc.)
My problem is finding the LCD and steps to solve reational expressions.
7x + 1 divided by x squared minus 9 (minus) 5 divided by x minus 3
Thank you! What is the gradient of the graph of the linear equation 7x-4y=28?