exam Maths Puzzle Numerical Ability

solve each system:

2x- y+3z=-14
3x-2y+4z=11
5x+ y-6z=-32


i am very confused on how to solve this...please help!

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(2x+5)^1/2=4
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a^2 - b^3(a - b) if a = 1/3 and b = - 1/2