x-(40%x-2)-( 14x+3)=20

x-0.4x+2-0.25x-3=20

0.35x=20+ 1

x = 60

60-20=40 (Ben);

Or:

60×40%-2+60× 14+3

=24-2+ 15+3

=40 (Ben)

Xiaohong and Xiaoming repaired 40 books.