exam Maths Puzzle Numerical Ability

Could you please help me solve this system of equations?

5x+3y+z=-13
x-3y+2z=1
14x-2y+3z=-16

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exam Other Question

How do I solve this equation for p?
log(p/(1-p))=-3.059 X^2-6x+4>0. Problem is, the 4 and -6 are not factorable. I tried using quadratic formula and -6^2 is an imaginary #. I ended up getting 3+ or - square root 6i-16.