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### Question Asked by a Student from EXXAMM.com Team

** 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?