exam Maths Puzzle Numerical Ability

Factor each of the polynomials completely. 14x^2 - 20x + 6. I factored 14 to 7*2 and 6 to 2*3. then the parenthesis. (7x -3)(2x -2). But what I do not understand is how this would equal 20x. That is the part I am stuck on.

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exam Other Question

The ratio of the length to width of a photograph is 1.5 to 1. If the photograph is enlarged, the length will measure 21 centimeters.

What will the width measure?
please help me solve problem number 27 of page 152, Review exercises. thankyou.