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The bending moment, M. of a beam is given by M= 3000 - 500z- 20x 2 where z is the distance along the beam from

The bending moment, M. of a beam is given by

M= 3000 - 500z- 20x²

where z is the distance along the beam from one end. At what distance along the beam is the bending moment equal to zero?

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