exam Maths Puzzle Numerical Ability

x+y+z=6
2x-y+3z=9
-x+2y+2z=9

"please show me step by step using elimination"

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exam Other Question

2. x - 2 over x - x over by x + 3
3. 1 - 4 over 9 over a - 16 over 9
4. 3 over y squared - 4 + 1 over 4 over y - 2 + 1
5. 9 - x squared over y squared over 3 - x over y
Please help. I struggle with these.
In 2000, the circulation of a local newspaper decreased from 3041 papers sold in January to 2326 papers sold in December. Find the percent of decrease.