exam Maths Puzzle Numerical Ability

i need help adding real numbers?

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exam Other Question

Can you please tell me if this is figured right?

Simplify: ( x/x^2 � 9 ) � ( x/x^2 + 2x � 15 )

(1 - 9) - (3x - 15)
-8 - - 12
-8 + 12
= 4 Can you help me with these, I am ok on the others but having trouble with these.