Mathematics, 26.08.2021 05:50 smagallanes

What property justifies the number sentence that goes with 4 + (7 + 8) = 19 changing to (7 + 8) + 4 = 19

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What property justifies the number sentence that goes with 4 + (7 + 8) = 19 changing to (7 + 8) + 4...