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Q 2015880760.     Considering the earth as a plane having equation
`5x + 9y - 10z + 138 = 0`, a monument is standing
vertically such that its peak is at the point
`( 1, 2, -3 )`. Find the height of the monument.
How can we save our monuments?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)