a) 1 5 -10 4 0 0 0 0b) 1 0 3 0 1 -5 0 0 0c) 1 0 0 2 7 0 1 0 0 9 0 0 0 0 0 0 0 0 0 0d) 1 -3 -10 0 0 0 0 0 0How many free variables in each??
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