exam Maths Puzzle Numerical Ability

Could you please help me solve this system of equations for the solution set?
5x+3y+z=0
x-3y+2z=9
14x-2y+3z=11

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exam Other Question
i would really appriciate help with this problem sqrt(243)/sqrt(3)

so far i have 9sqrt3 times sqrt(3)/sqrt(3) times sqrt(3)

what i dont get is how to multiply the top part





thank you 3 radical 25 over 4