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solve(sqrt(0.001)/0.011*(7*y)^(5/3)/(7+2*y)^(2/3)-sqrt(2*9.81*(5-y))*7*y=0,y)
solve(sqrt(0.001)/0.011*(7*y)^(5/3)/(7+2*y)^(2/3)-sqrt(2*9.81*(5-y))*7*y=0,y)
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