Turn the wrong equation into correct | Matchstick Puzzle 3-6=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 7+6=9
2) Matchstick puzzle 2+6=9
3) Matchstick puzzle 2+9=4
4) Matchstick puzzle 2-9=1
5) Matchstick puzzle 3-6=1
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