exam Maths Puzzle Numerical Ability

I don't know how to solve this system. I know I should get 3 answers.
x+3y-z=-1
3x+2y+z=4
2x+5y+3z=-1

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exam Other Question

Solve for x if /3 x/ =11
/-5 2x/

Which is the answer?

a. -1

b. 1

c. 0 find a polynomial with leading coefficent 1 and degree 3 that has -1,11, and 3 as roots