exam Maths Puzzle Numerical Ability

A board 20 feet long is cut into two pieces such that the lenght of one piece is two-thirds of the lenght of the other piece. find the lenght of the shorter piece of board.

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(x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee What is the answer to x=4 and 2x-3y=-19