kill(all)$
fpprintprec:5$

f(x,y,z):=(x+y+z)^2-36$
g(x,y,z):=(x^2)*(y^2)*(z^2)-36$
h(x,y,z):=(x^3)+(y^3)+(z^3)-36$

d  : 0.0001$

for a: 2.420 thru 2.431 step d do
( x : a, y : a,
 for z: 1.01 thru 1.02 step d do
    if ( abs(f(x,y,z)) + abs(g(x,y,z)) + abs(h(x,y,z)) ) < 7.687 then
    print(x,y,z)
);