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Mathematics 20 Online
OpenStudy (anonymous):

Indicate which property is illustrated in step 1? Step 1 7+(2+9) +0=7+(9+2)+0 Step 2 =(7+9)+(2+0) Step 3 =(7+9)+2 Step 4 =16+2

OpenStudy (anonymous):

First correct answer gets fan and medal!!!

OpenStudy (amoodarya):

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