[Maxima] variables

[Mahery Raharinjatovo]

I want solve this équation
eq:k*x+m*'diff(x,t,2)+b*'diff(x,t)=0;
But before , variables must be declared
there are three cases:
 I know the first and second
assume(4*k*m-b^2>0); or
assume(4*k*m<0);
I don't know how to do the equality
Please help me.
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