exam Maths Puzzle Numerical Ability

Please help me simplify.
x^2+6x-27/3-x. The book says the answer is -(x+9)

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exam Other Question

The sum of a number and three times another number is 18. Find the numbers if their product is a maximum. Please Help :) solve and check for x

x/x-2 minus x+1/x = 8/x^2-2x

I think I need to start with finding the LCD

Can someone help please?

Thanks