exam Maths Puzzle Numerical Ability

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(2m+n)^5
thank you so much!
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exam Other Question

x+y+z=-3
2x+5y+2z=-12
-x+9y-3z=-11 I have a problem on one of my quiz' for my pre-algebra class. I think I am solving the problem correctly but I am unsure because we have not done many problems like this yet. I h