Question: For a matrix A with 7x6 whose inputs are real numbers, if the dimension of the vector space {x R: Ax = 07x1} is

For a matrix A with 7x6 whose inputs are real numbers, if 

For a matrix A with 7x6 whose inputs are real numbers, if the dimension of the vector space {x R: Ax = 07x1} is 4,then what is the rank of A ?

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