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A rectangular tube of uniform cross sect...

A rectangular tube of uniform cross section has three liquids of densities `rho_(1), rho_(2)` and `rho_(3)`. Each liquid column has length `l` equal to length of sides of the equilateral triangle. Find the length `x` of the liquid of density `rho_(1)` in the horizontal limb of the tube, if the triangular tube is kept in the vertical plane.

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