book Maths Puzzle Numerical Ability

How do I solve a problem dealing with the Rational Roots Theorm? For example 2x³-6x+9=0

Also would 3-x/5x=20 be classified as a linear eguation or a quadratic equation?


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what is the answer to 1 1/4x +1/2= 5/1 Can anyone show me how to do this properly please.

3x^2-6x/3x^3 divided by x-2/6x^2

Your help will be greatly appriciated.