book Maths Puzzle Numerical Ability

5-3[4-(5 + 2)] - 9

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book Other Question

Write a system of two equations in two unknown. Solved by method of choice. I can't figure out how to pull out the data and set it up.

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System of Equations with 3 variablies

4x – 5y – 5z = –24
–x – y + 3z = 13
5x + y + 4z = 11