-7.9 + 8.2 - 3.4 + 2.1

(Original problem)

-7.9 + 8.2 + (-3.4) + 2.1

(Additive inverse)

-7.9 + (-3.4) + 8.2 + 2.1

(Associative property)

(-7.9 + (-3.4)) + (8.2 + 2.1) (Commutative property)

-11.3 + 10.3 (Simplify)

-1 (Simplify)

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