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We study point and higher symmetries for the hydrodynamic-type systems with two independent variables t and x with and without explicit dependence of the equations on t,x. We consider those systems which possess an infinite-dimensional group of the hydrodynamic symmetries, establish existence conditions for this property and, using it, derive linearizing transformations for these systems. The recursion operators for symmetries are obtained and used for constructing infinite series of exactarXiv:math-ph/0104014v1 fatcat:5445juyitvhghckoygrkql3zhq