match,use_macro;
vary,name=x1;
vary,name=x2;
vary,name=x3;
vary,name=x4;
m1: macro={ };
constraint,expr=   x1+2*x2-3*x3+4*x4=0;
constraint,expr= 5*x1+2*x2+7*x3+1*x4=0;
constraint,expr= 6*x1+2*x2+3*x3+3*x4=0;
jacobian,strategy=2;
endmatch;