exam Maths Puzzle Numerical Ability

Find all positive values for K

x2 + x - k

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exam Other Question

Hi. Can I have some help with the following problem?

Boyle's Law states that the pressure P of a sample of gas is directly proportional to the temperature T and inversely propor 1.) 3x/(x+1) + 6/2x = 7/x

2.) 6x/(x+4) + 4 = 2x+2/(x-1)

3.) 7x+1/2x+5 + 1 =10x-3/3x

4.) 10/x^2-2x + 4/x = 5/x-2