\frac{\left(x-7\right)}{3}=\frac{\left(y-2\right)}{2}=\frac{z-1}{-2}=k,\:k=1\frac{\left(x-7\right)}{3}=\frac{\left(y-2\right)}{2}=\frac{z-1}{-2}=k,\:k=1

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