exam Maths Puzzle Numerical Ability

how do i go about simplifing this to the simplest form?
x-13/x^2-x-12+3x-3/x^2-x-12

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exam Other Question

One thousand liters of a solution was available, but the solution was 90% alcohol. Jim needed a solution which was 80%percent alcohol. How many liters of alcohol had to be extracted so that the solution would be 80% alcohol? I=Prt Solve for r

7x + 3 > 9x -5

5x -5 <_2x +10

beginning algebra 6th edition
chapter 2 pg166 problem 10
pg. 181 problems 24, 26