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{SECT 0 {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 39 "de:=8*diff(x(t),t$2)
+b*diff(x(t),t)=80;" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "ini:
=x(0)=0,D(x)(0)=0;" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "sol:=
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"fsolve(subs(t=.25,rhs(sol))=.25,b);" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 23 "v(t):=diff(rhs(sol),t);" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 19 "a(t):=diff(v(t),t);" }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 40 "evalf(subs(\{t=.25,b=22.72225159\},v(t)));" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 40 "evalf(subs(\{t=.25,b=22.7222
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