pIf the \( x \)-coordinate of a point on the line joining the points \( \mathrm{P}(2,2,1) \) and...

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pIf the \( x \)-coordinate of a point on the line joining the points \( \mathrm{P}(2,2,1) \) and \( \mathrm{Q}(5,1,-2) \) is 4 , find its z-coordinate./p
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