book Maths Puzzle Numerical Ability

i need help with this one

4x + 4y + Z=8
5x-2y-Z=12
3x + y + 3Z=-5

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book Other Question

If f(x) = x(x � 1)(x � 4)^2, use interval notation to give all values of x
where f(x) > 0. The sum of three consecutive odd integers in 195. What are the three numbers?