To add -1/3/10 and -4/2/15, we first need to find a common denominator. In this case, the common denominator is 30.
-1/3/10 = -10/30
-4/2/15 = -30/30
Now we can add the two fractions:
-10/30 + -30/30 = -40/30
Simplifying the fraction by dividing both the numerator and the denominator by their greatest common divisor, we get:
-40/30 = -4/3
-1/3/10 + - 4/2/15
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