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((5*x^2-20)/(x+3))*(1/(5*x-10))-2 = 0;x
x
d-(2*(d-x))+x;2*d+x-154
C-(4*pi*R)^-1;T-(140*pi*C)^-1;K-(1/(pi*C));6-((1/(2*pi*C))*((R+T)/(K*R*T))^(1/2))
(3*10)/2
(10*e)/3 < 92
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