exam Maths Puzzle Numerical Ability

solve for x
log2x + log2(x^2-9) = log2(-5x)

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exam Other Question

One-third of a number, decreased by 1 is 8.
What is the number?
Can anyone assist me with the following 2 problems?
Thank you very much.

Subtract and Simplify
w-5 - 8w-17
w 11w
The w is under the w-5 and th