exam Maths Puzzle Numerical Ability

9x+7=5x-3

please explain.

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Textbook Beecher and Penn

Perform the operation and simplify x^2-2x-15/x^2+x-6*x^2-4/x^2-2x-35

Thanks for your help! The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cm cubed, what is the volume of this pyramid? To the ne