Resposta :

2(3,1,0) + ( m,2,-1) = (10,4,-1)

(6, 2, 0 ) +   ( m,2,-1) = (10,4,-1)

 6 + m = 10 ==> m = 10 - 4 ==> m = 6
    2 + 2 = 4
   0 - 1 = - 1

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