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If A = [ [ 2 , -3 ] , [ 5, -4 ] , [ -6 ...

If `A = [ [ 2 , -3 ] , [ 5, -4 ] , [ -6 , 1 ] ]` , `B = [ [ -1 , 2 ] , [ 2 , 2 ] , [ 0 , 3 ]]` , `C = [ [ 4 , 3 ] , [ -1 , 4 ] , [ -2 , 1 ]]` then show that `( A + B ) + C = A + ( B + C )`

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