book Maths Puzzle Numerical Ability

Please help explain and Solve?:
2 4
- (x+6)> - (x-8)
3 5

Express your answer in interval notation


Thank you!

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book Other Question
I have two problems i need help with. I need to solve these by using the quadratic equation.

1: 3x^2 - 2x = 15x - 0

2: x^2 - 3x - 23 = 5


Any help would be greatly appreciated 5/x+4=4+3/x-2