exam Maths Puzzle Numerical Ability

Find the sum. Express the answer in simplest form.

-6g^2+9/h^2-2 + 7g^2-6/h^2-2

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exam Other Question
Is f(x)= -2x a one to one function? Could someone please help me solve 5-x=3(2-x)+2x?

Thanks so much for the help!