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Alternatively, try this:
awk '$1=$1' FS='\n' OFS=';' RS= infile

awk 'END {
if (r) print r
}
/^\([0-9]+\)/ {
print r; r = x
}
{
r = r ? r OFS $0 : $0
}' OFS=\; infile

On Solaris use nawk or /usr/xpg4/bin/awk.