exam Maths Puzzle Numerical Ability

PLease help to solve

2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6

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exam Other Question

use synthetic division to divide: (x^2-4x-2)/[x-(3+2i)] Solve the following systems by substitution
8x - 4y = 16
y = 2x - 4