exam Maths Puzzle Numerical Ability

Please help me solve the system:
{x+y-4z=6
{2x-5y+3z=2
{x-6y+7z= -4.
thank you.

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exam Other Question

Find the value of $950 invested at 4.5% with interest compounded continuously for 5 years.
How many years will it take for a $160 investment to double in value if interest is comp x+4y=-8