exam Maths Puzzle Numerical Ability

9x-5x^2=-2

2x^2-3x=x^2+18

15x^2+x=2

x^2-6x+9=-16

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HELP! Ana, Bob, and Chris will not disclose their weights but agree to be weighed in pairs Anna and Bob together weigh 226 pounds. Bob and Chris together weigh 210 pounds. Anna and Chris together weigh 200 pounds. How much does each student weigh? How do I simplify 3n-4 divided by 4-3n and how do I simplify 6y cubed + 12y over 9y cubed + 18y squared