book Maths Puzzle Numerical Ability

{9x-y-2z=18
{5x-2y+z=10
{4x+y-3z=8 please help me with this

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book Other Question

Use the Gauss Jordan method to solve the system of equations:
x+y+2z=7
3x-y+z=10
2x+y-3z=-6
simplify the rational expression

- x^2 + 10x - 21 / -3x^2 + 23x - 14