Book Maths Puzzle Algebra

How do you solve this problem?
X=(200-P)+(50-(P/2))

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Book Other Question

I was hoping someone could show me how to divide a polynomial by a binomial.

3x to the 3rd power - 14xto the second power + 9x-4
______________________________________________ A petroleum company has two different sources for crude oil. The first source provides oil that is 60% pure, and the second one provides oil that is 85% pure. In order to obtain 80