clc
//initialisation of variables
clear
n1=1
n2= 3
n3=2
//CALCULATIONS
a1= -n1
a2= -n3
a3= -n1-a2+3*a1
b1= -n1
b2= -n1
b3= n1+3*b1-b2
//RESULTS
printf ('a1 = %.f ',a1)
printf ('\n a2 = %.f ',a2)
printf ('\n a3 = %.f ',a3)
printf ('\n b1 = %.f ',b1)
printf ('\n b2 = %.f ',b2)
printf ('\n b3 = %.f ',b3)