clc
clear
disp ("ck")
a=[6 12 -4; 7 -2 3; 2 8 -9]
b=[70; 5; 64]
solutions=a\b
c=[6 -4 8; -5 -3 7; 14 9 -5]
d=[112;75;-67]
solutionss=c\d