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Verified Answer :

-2 -21=42
    -2-21= -23   NOPE

-3
-14 = 42
    -3-14= 17  NOPE

-7*-6= 42
     -7-6 = -13  YES!!!

The answer is -7 and -6.

-6 multiple by -7 equals 42. when you add them = -13.
-6*-7= 42
-6+-7= -13