exam Maths Puzzle Numerical Ability

How do I do this again. Please help?Please.
Solve.

x/7-1/2= x-11/2

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exam Other Question

Multiply. (x- 10)(x + 9)

I tried to do this one and ended up with the same equation. I am not sure how. Please help.
Thanks. List all of the possible rational zeros of f(x)=3x^5-7x^3+2x-15.