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Write the equation of the straight line through the point `(alpha,beta,gamma` and parallel to z-axis.

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Direction ratios of the line parallel to `z`-axis will be `(0,0,1)`.
So, equation of the line through the point `(alpha,beta,gamma)` and parallel to `z`-axis will be,
`(x-alpha)/0 = (y-beta)/0 = (z-gamma)/1`.
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