Turn the wrong equation into correct | Matchstick puzzle 9-2=1

Turn the wrong equation into correct | Matchstick puzzle 9-2=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 17+1=16
2) Matchstick puzzle 0+3=5
3) Matchstick puzzle 8+7=11
4) Matchstick puzzle 5+17=6
5) Matchstick puzzle 9-2=1
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