exam Maths Puzzle Numerical Ability

solve the system:
{x+5y-z=4
{3x+4y+z=4
{x-y+z=0.
thanks for the help.

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exam Other Question
–6 + 7(x – 1) = 2x + 5(x – 6) – 4 can i get help with this equation please?

x^2-96=0