It can't be done with whole numbers....but if you want decimals....these two will work 3.7731879764631448414184572689148 17.226812023536855158581542731085
21 and 7
-43
79
129
-5 + √21 ≈ -0.4174 -5 - √21 ≈ -9.5826
The numbers are: 3 -sq rt of 21 and 3 +sq rt of 21
109
-13
3*7 = 21
2+21=23 2*21=42 (* is another symbol for multiply)
21 and 5
21