book Maths Puzzle Numerical Ability

How would you write (-3x)^-2 using positive exponents and simplified?

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Can someone please help with this question:

Solve the following system of equations:
-x+5y-2z=2
-x+4y+5z=1
x-6y+4z=-3

Thanks, I cannot figure out how to start this equation

3(x+4 -1) =15 The (x+4-1)is divided by 2
2