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(9.81*12.98*(0.131-((1261*0.00331^3*pi)/6)))/(0.00331*1*3*(2.4*(0.00331/0.039)+1)*pi) = 0
(g*t*(m-((pi*d^3*r)/6)))/(3*pi*d*l*(2.4*(d/D)+1)) = 0
x^4-2*x;x^2+5*x-6
0;0
72*(5/6) = 0
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