<PRE><B>Question 897255</B>
Which way do you want to solve the system?  A good but less advanced way is substitute for z in the other two equations and you will have a system of two equations in two linear variables x and y.


{{{system(x+y+x-6=30,x+5y+20(x-6)=214)}}}


{{{system(2x+y=36,x+5y+20x-120=214)}}}


{{{system(2x+y=36,21x+5y=334)}}}


Continue solving with that simpler system however you want.</PRE>