Autumn misplaced 7 and broke 3, so that lost her 7+3 = <<7+3=10>>10 pencils
Autumn found 4 pencils and bought 2, so she gained 4+2 = <<4+2=6>>6 pencils
She started with 20 pencils, lost 10 and gained 6 so she had 20-10+6 = <<20-10+6=16>>16 pencils left
#### 16