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in a closed 2 tank both tank a and tank b have 500 gallons of salt...

in a closed 2 tank both tank a and tank b have 500 gallons of salt solution with initially tank a having 100 pounds of salt and tank b having 0 pounds of salt. water is leaving tank a and entering tank b at 1 gal/min and water is leaving tank b and entering tank a at 1 gal/min solve the linear system
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