Answer:
The answer is "commutative property"
I try to explain, −7.9+(−9.03+(−0.1)) is the initial operation, that can be semplified in this way -7.9-9.03-0.1
−7.9+(−0.1+(−9.03)) is the operation commutated, simplifying it -7.9-0.1-9.03
It's the same, numbers are just switched of position.
Step-by-step explanation: