exam Maths Puzzle Numerical Ability

ok I want to see if I am doing this right?

(8/21w) + (2/9w)

3w/(21w)(9w) + 2(21w)/(21w)(9w)

3w+42w/(21w)(9w)
Now is this correct?
Do I have to simplify it more?
I got 2/3w

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