exam Maths Puzzle Numerical Ability

How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much.

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What should be the diameter (d) of a pizza so that it has the same areas as two 10-in.-diameter pizzas? Do you get more to eat with a 15-in. pizza or two 10-in. pizzas? 1. Helen has 1/5 of her portfolio in U.S. stocks, 1/8 of her portfolio in European stocks, and 1/10 of her portfolio in Japanese stokc. The remainder is invested in municipal bonds