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If excess metallic iron is added to an N-cuso4 solution, calculate the approximate concentration of cu+2 when equilibrium is established? What is general formula for finding sizes a, b and c of scalene triangle ABC knowing exradii r-a, r-b. r-c of escribed circles? Distance kilometer from chilanga district to mwansabomwe? Simplify: (2x - 4) - (6x + 6)? A vector has direction angles α = 75° and β= 55° Find the value of γ and Find a vector that has those direction angles?