Move only 1 stick to fix the equation | Matchstick puzzle 15-9=1

I was completely stumped by this last puzzle , but maybe you've already figured it out ? Please share your knowledge in the comments below !

You will see answer of these puzzles :-

1) Matchstick puzzle 11+2=9
2) Matchstick puzzle 6-7=2
3) Matchstick puzzle 9-5=2
4) Matchstick puzzle 3+17=8
5) Matchstick puzzle 15-9=1
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