exam Maths Puzzle Numerical Ability

√2(9 √5 - 7 √9)=? I am finding it very hard to solve this type of problem. Can you help me out?

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7x - 2 + 3x - 9
The question is Sara takes 2 friends bread, she gives Judy 3times the aomunt then Jane. The total amount of loafs are 12. How many does judy get?