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 coordinates of the endpoint of a segment with the given endoint and midpoint M. Suppose m<JKL is 90Degrees. If the ray KM bisects <JKL, what are the measures of<JKM and <L I am having problem,s with this problem

Solve equations for X
x^2+4x+4=7

Thank a million for the help